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CBSE Class 9 Answered

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 | 11 Dec, 2013, 03:37: AM
answered-by-expert Expert Answer

Total number of students = 38

(i) Number of students whose weight is at most 60 kg = 9 + 5 + 14 + 3 + 1 + 2 = 34

Probability that weight of student is at most 60 kg 

(ii) No. of students whose weight is at least 36 kg

= 5 + 14 + 3 + 1 + 2 + 2 + 1 + 1 = 29

Probability that the weight of a student is at least 36 kg =

(iii) No. of students whose weight is not more than 50 kg

= 9 + 5 + 14 + 3 = 31

Probability that the weight of a student is not more than 50 kg = 

Answered by | 11 Dec, 2013, 05:37: AM

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