Q8 of 50 Page 15

1500 families with 2 children were selected randomly, and the following data were recorded:


If a family is chosen at random, compute the probability that it has:


(i) No girl


(ii) 1 girl


(iii) 2 girls


(iv) At most one girl


(v) More girls than boys.

Explanation:


Given:


Total number of families = 211 + 814 + 475 = 1500


(i) Number of families having no girl = 211


Required probability


(ii) Number of families having one girl


(iii) Number of families having 2 girls


(iv) Number of families having at most one girl


(v) Number of families having more girls than boys


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6

If two coins are tossed simultaneously, find the probability of getting at least one head.

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A die is thrown. Find the probability of:

(i) Getting a prime number


(ii) Getting an odd number


(iii) Getting an odd-prime number

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Eleven bags of wheat flour, each marked 5 kg, actually contained the following weights of flour (in kg):

4.97 5.05 5.08 5.03 5.00 5.06 5.08 4.98 5.04 5.07 5.00


Find the probability that any of these bags chosen at random contains more than 5 kg of flour

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The percentage of marks obtained by a student in monthly unit tests are given below :


Find the probability that the student gets :


(i)More than 70% marks


(ii) Less than 70% marks


(iii) A distinction.