The number of children recorded to each of 25 families were
2,4,1,0,1,3,0,4,2,6,0,0,2,3,1,5,4,0,3,1,2,5,3,4,1. (8%)
(1) What is the value of sample mean?
(2) What is the value of sample variance?
A man forgets his banker's card 10% of the time, he forgets his cheque book
5% of the time and he forgets both 2% of the time. (8%)
(1) What is the probability that, on any one day, he will have both his banker's
card and his cheque book?
(2) What is the probability that he will find his banker's card in his pockets
given that he has already found his cheque book?
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