Question

1. In a cricket match, a batswoman hits a boundary 6 times out of 30 balls she plays. Find
the probability that she did not hit a boundary.
2. 1500 families with 2 children were selected randomly, and the following data were
recorded:
Number of girls in a family
2.
1
0
Number of families
475
814
211
Compute the probability of a family, chosen at random, having
() 2 girls
(ii) 1 girl
Also check whether the sum of these probabilities is 1.
(ii) No girl
Tind the probability that a student of these are time ​

Answer 1

(i) Number of families with 2 girls = 475

Total number of families = 150

P(E) =(Number of favourable outcomes)/(Total number of event)

=475/1500

=19/60

(ii) Number of families with 1 girl = 814

P(E) = (Number of favourable outcomes)/(Total number of event)

=814/1500

=407/750

(iii) Number of families with no girl = 211

P(E) = (Number of favourable outcomes)/(Total number of event)

=211/1500