The following observations have been written in ascending order: 28, 31, 47, 51, a, a + 3, 71, 74, 78, 90 If the median of the data is 61.5, then the mean of the data is:

In a moderately skewed distribution, if Mean = 12 and Median = 8, then using Empirical relation (Mode = 3 Median - 2 Mean), what is the value of Mode?

If 4y - 5x = 15 is the regression line of y on x and the coefficient of correlation between x and y is 0.75, what is the value of the regression coefficient of x on y (bxy)?