Arithmetic mean of 10 observations is 60 and sum of squares of deviations from 50 is 5000. What is the standard deviation of the observations?

The mean and standard deviation of a binomial distribution are 12 and 2 respectively. What…

Let A and B are two mutually exclusive events with P(A) = 1/4 and P(B)…

If two fair dice are thrown, then what is the probability that the sum is…

A sample of 5 observations has mean 32 and median 33. Later it is found…

If the regression coefficient of x on y and y on x are -1/2 and…