CBSE Class 9 Answered
on one page of a telephone directory, there were 200 telephone numbers. The frequency distribution of their unit's digit is given in the following table:
Unit's digit 0 1 2 3 4 5 6 7 8 9
Frequency 22 26 22 22 20 10 14 28 16 20
out of the numbers on the page, a number is chosen at random. What is probablity that the unit's digit of the chosen number is
(i) 6?
(ii) a nonzero multiple of 3?
(iii) a nonzero even number?
(iv) An odd number?
Give reason for your answer.
Asked by gspublicschool | 09 Oct, 2018, 07:10: AM
Expert Answer
i) Acoording to the question,
Let A be the event that getting a number whose unit's digit is 6.
n(A) = 14 and n(S) = 200
P(A) = 14/200 = 7/100
ii) A non zero multiple of 3.
Let B be the event that getting a non zero multiple of 3 at unit's place
n(B) = 22 + 14 + 20 = 56
P(B) = 56/200 = 7/25
iii) Let C be the event that getting non zero even number
n(C) = 22 + 22 + 20 + 14 + 16 = 94
P(C) = 94/200 = 47/100
iv) Let D be the vent that getting odd number at unit's place.
n(D) = 26 + 22 + 10 + 28 + 20 = 106
n(D) = 106/200 = 53/100
Answered by Sneha shidid | 12 Oct, 2018, 10:02: AM
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