Let x be the HM and y be the GM of two positive numbers m and n. If 5x = 4y, then which one of the following is correct?

If the mean of a frequency distribution is 100 and the coefficient of variation is 45%, then what is the value of the variance?

Let two events A and B be such that P(A) = L and P(B) = M. Which one of the following is correct?

For which of the following sets of numbers do the mean, median and mode have the same value?