Let x, y, z be positive real numbers such that x, y, z are in GP and tan⁻¹ x, tan⁻¹ y and tan⁻¹ z are in AP. Then which one of the following is correct?

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…