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Home /Doubts and Solutions/CBSE/Class 9/Mathematics/Probability/Problems On Empirical Probability

# Problems On Empirical Probability Free Doubts and Solutions

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## 1+1

Asked by pkirankumar4321 23rd February 2015, 9:36 PM

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## qus 1  - Show how if two coins are tossed simultaneously. the probablity of getting atmost one head is 3/4.     qus 2 - A bag contains 50 coins and each coin is marked from 51 to 100. one coin is picked at random. find the probability that the number on the coin is a prime number.

Asked by Varsha 25th January 2015, 6:09 PM

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## when udar purchased an item online froma australia for AUD 350.00,the exchange rate wasc 1000 INR for aud 17.50. udars bank charged him 1.5% for the transaction.

Asked by thomassubin32 1st September 2014, 9:11 PM

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## Three coins are tossed simultaneously 200 times with the following frequencies of different outcomes: Outcome 3 Heads 2 Heads 1 Head No Head Frequency 23 72 77 28 From the above data, find the probability of getting (i) 2 heads, (ii) 2 tails, (iii) 3 tails.

Asked by Topperlearning User 4th June 2014, 1:23 PM

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### CBSE - IX - Mathematics - Probability

Asked by Topperlearning User 4th June 2014, 1:23 PM

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## A coin is tossed simultaneously for a number of times. The ratio of number of heads obtained to the number of tails obtained is 4: 5. What is the probability of getting a head in the next throw?

Asked by Topperlearning User 4th June 2014, 1:23 PM

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### CBSE - IX - Mathematics - Probability

Asked by Topperlearning User 4th June 2014, 1:23 PM

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### CBSE - IX - Mathematics - Probability

Asked by Topperlearning User 4th June 2014, 1:23 PM

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### CBSE - IX - Mathematics - Probability

Asked by Topperlearning User 4th June 2014, 1:23 PM

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### CBSE - IX - Mathematics - Probability

Asked by Topperlearning User 4th June 2014, 1:23 PM

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## In the past 50 cricket matches between two teams A and B, team A had won 29 matches. What is the experimental probability that in the next cricket match between the two teams, team A will lose?

Asked by Topperlearning User 4th June 2014, 1:23 PM

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### CBSE - IX - Mathematics - Probability

Asked by Topperlearning User 13th December 2013, 3:16 AM

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## Sita says that in word MADAM, the probability of letter M is equal to that of letter A. Is she right? What value it represents?

Asked by Topperlearning User 13th December 2013, 3:06 AM

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### CBSE - IX - Mathematics - Probability

Asked by Topperlearning User 13th December 2013, 3:01 AM

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## A die is rolled 70 times such that an even number occurred 46 times and an even number less than 5 occurred 24 times. What is the probability of getting the number 6 on the die?

Asked by Topperlearning User 13th December 2013, 2:19 AM

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### CBSE - IX - Mathematics - Probability

Asked by Topperlearning User 13th December 2013, 2:16 AM

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## A bag contains 12 balls out of which x are white. If one ball is taken out from the bag, find the probability of getting a white ball. If 6 more white balls are added to the bag and the probability now for getting a white ball is double the previous one, find the value of x.

Asked by Topperlearning User 12th December 2013, 10:11 AM

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## In making a math project, a teacher found out that 26 people took two to three hours, 14 people took three to four hours and 10 people took more than four hours to complete a particular assignment. What is the experimental probability that the assignment can be done in less than four hours?

Asked by Topperlearning User 12th December 2013, 9:37 AM

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## Twenty four people had a blood test and the results are shown below. A, B, B, AB, AB, B, O, O, AB, O, B, A AB, A, O, O, AB, B, O, A, AB, O, B, A (a) Construct a frequency distribution for the data. (b) If a person is selected randomly from the group of twenty four people, what is the probability that his/her blood type is not O? (c) What value do you draw from this activity?

Asked by Topperlearning User 12th December 2013, 9:35 AM

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## A survey found that ages of 250 workers in a factory is distributed as follows: Ages (in years) 20 - 29 30 - 39 40 - 49 50 - 59 60 and above Number of workers 50 35 95 55 15 If a person is selected at random, find probability that the person is: (i) 40 years or more (ii) having age from 30 to 39 years (iii) under 60 years but over 39 years.

Asked by Topperlearning User 11th December 2013, 3:48 AM

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## Two dice are thrown 400 times. Each time sum of two numbers appearing on their tops is noted as given in the following table: Sum 2 3 4 5 6 7 8 9 10 11 12 Frequency 14 20 32 45 62 65 60 43 36 18 5 What is the probability of getting a sum (i) 5 ? (ii) more than 10 ? (iii) between 5 and 10?

Asked by Topperlearning User 11th December 2013, 3:43 AM

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## Two dice are thrown simultaneously 500 times. Each time the sum of two numbers appearing on them is noted and recorded in the following table:  Sum  2 3 4 5 6 7 8 9 10 11 12 Frequency 14 30 42 55 72 75 70 53 46 28 15 From the above data, what is the probability of getting a sum (i) more than 10 (ii) between 8 and 12.

Asked by Topperlearning User 11th December 2013, 3:40 AM

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## Following distribution gives the weight of 38 students of a class. Weight in kg. 31 - 35 36 - 40 41 - 45 46 - 50 51 - 55 56 - 60 61 - 65 66 - 70 71 - 75 No. of students 9 5 14 3 1 2 2 1 1 Find the probability that weight of student in the class is (i) at most 60 kg. (ii) at least 36 kg. (iii) not more than 50 kg.

Asked by Topperlearning User 11th December 2013, 3:37 AM

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## The age (in years) of workers are as follows: Age (in yrs) 10 - 19 20 - 29 30 - 39 40 - 49 50 - 59 60 and above No. of workers 5 40 26 15 8 6 If a worker is selected at random, find the probability that the person is: (a) 30 years or more (b) below 50 years

Asked by Topperlearning User 11th December 2013, 3:34 AM

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## The percentage of marks obtained by a student in monthly unit test are given below: Unit Test 1 II III IV V % Marks 70 72 65 68 85 Find the probability that the student gets (a) more than 70% marks (b) more than 90% marks

Asked by Topperlearning User 11th December 2013, 3:32 AM

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## The weekly pocket money of students are given in the following table:  Pocket Money (in Rs) Number of students 145 7 140 4 159 10 171 6 158 3 147 8 165 12 Find the probability that the weekly pocket money of a student is: (a) Rs 159 (b) more than Rs 159 (c) Less than Rs 159

Asked by Topperlearning User 11th December 2013, 3:29 AM

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### CBSE - IX - Mathematics - Probability

Asked by Topperlearning User 11th December 2013, 3:25 AM

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### CBSE - IX - Mathematics - Probability

Asked by Topperlearning User 11th December 2013, 3:12 AM

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### CBSE - IX - Mathematics - Probability

Asked by Topperlearning User 11th December 2013, 3:10 AM

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### CBSE - IX - Mathematics - Probability

Asked by Topperlearning User 11th December 2013, 2:34 AM

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### CBSE - IX - Mathematics - Probability

Asked by Topperlearning User 11th December 2013, 2:30 AM

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### CBSE - IX - Mathematics - Probability

Asked by Topperlearning User 11th December 2013, 2:23 AM

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### CBSE - IX - Mathematics - Probability

Asked by Topperlearning User 11th December 2013, 2:18 AM

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### CBSE - IX - Mathematics - Probability

Asked by Topperlearning User 11th December 2013, 2:10 AM

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## Following table shows the marks obtained by 30 students in a class test: Marks Obtained 70 58 60 52 65 75 68 Number of Students 3 5 4 7 6 2 3 Find the probability that a student secures (a) 60 marks (b) less than 60 marks.

Asked by Topperlearning User 11th December 2013, 1:20 AM

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### CBSE - IX - Mathematics - Probability

Asked by Topperlearning User 11th December 2013, 1:18 AM

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## 12 packets of salt, each marked 2 kg, actually contained the following weights (in kg) of salt: 1.95, 2.02, 2.06, 1.98, 2.03, 1.97, 2.04, 1.99, 1.985, 2.025, 2.00, 1.98 Out of these packets one packet is drawn at random. What is the probability that the chosen packet contains more than 2 kg of salt?

Asked by Topperlearning User 11th December 2013, 1:12 AM

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## A survey at a university was conducted among 880 students. Of these, 500 identified themselves as "smokers". Compute the empirical probability that a randomly selected student is not from a "smoker".

Asked by Topperlearning User 11th December 2013, 1:10 AM

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## Two coins are tossed simultaneously 1000 times with the following frequencies of different outcomes: Outcomes 2 Heads 1 Head No Head Frequency 190 560 250 Find the probability of occurrence of each of these events.

Asked by Topperlearning User 11th December 2013, 1:09 AM

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## Three unbiased coins are tossed together. Find the probability of getting (i) Two heads (ii) At least two heads (iii) No head

Asked by Topperlearning User 11th December 2013, 1:05 AM

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## A bag contains cards numbered form 2 to 25. A card is drawn at random from the bag. Find the probability that selected card bears a number which is multiple of 2 and 3.

Asked by Topperlearning User 11th December 2013, 12:54 AM

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## Fifty seeds were selected at random from each of the 5 bags of seeds and kept under standardized conditions favorable for germination. After 20 days the number of seeds which had germinated in each collection were counted and recorded as follows: Bags 1 2 3 4 5 Number of seeds Germinated 40 48 42 39 41 What is the probability of germination of: (i) More than 40 seeds in a bag? (ii) 49 seeds in a bag? (iii) More than 35 seeds in a bag?

Asked by Topperlearning User 11th December 2013, 12:51 AM

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## A die is thrown 400 times. The frequency of the outcomes of the events are given as under: Outcomes 1 2 3 4 5 6 Frequency 70 65 60 75 62 68 Find the probability of: (i) Occurrence of an even number. (ii) Occurrence of a number less than 2.

Asked by Topperlearning User 11th December 2013, 12:49 AM

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## A bag contains cards numbered from 1 to 25. A card is drawn at random from the bag. Find the probability that selected card bears number which is multiple of 2 or 3.

Asked by Topperlearning User 11th December 2013, 12:44 AM

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## The following data shows the blood groups of 40 students of a class: Blood group A AB B O No. of students 10 15 12 3 A student is selected at random from the class. Find the probability that the child: (i) has blood group A (ii) has blood group O (iii) does not have blood group AB

Asked by Topperlearning User 11th December 2013, 12:38 AM

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## Three coins are tossed simultaneously 200 times with the following frequencies of different outcomes: Outcomes 3 heads 2 heads 1 head No heads Frequency 23 72 77 28 Find the probability of getting (i) 3 heads (ii) at least two heads (iii) two heads and one tail.

Asked by Topperlearning User 11th December 2013, 12:33 AM

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### CBSE - IX - Mathematics - Probability

Asked by Topperlearning User 11th December 2013, 12:23 AM

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## A survey of 10 student is done regarding the likes and dislike about the subject mathematics. The data are given below: Views Number of students Likes 80 Dislikes 20 Find the probability that a student chosen randomly (a) likes mathematics (b) does not like mathematics

Asked by Topperlearning User 11th December 2013, 12:08 AM

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## One card is drawn at random from a well shuffled deck of 52 cards. Find the probability for getting a face card.

Asked by Topperlearning User 11th December 2013, 12:05 AM