The mean and the variance of a binomial distribution are 4 and 2 respectively. Then the probability of 2 successes is?
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A sum of Rs 312 is divided among 100 boys and girls such that every boy gets an amount of Rs 3.60 and every girl gets 2.40 Rs. Calculate the number of girls in the group.
A man engaged a servant on a condn that he’ll pay Rs 90 and also give him a bag at the end of the yr. He served for 9 months and was given a turban and Rs 65. So the price of turban is i. Rs : 10 19 0 55
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