If P, Q, R, S are the vertex of a cyclic quadrilateral.

If the difference between the rank of the 4 observations are 2.5, 0.5, -1.5, -1.5, then Spearman's rank correlation coefficient equals to:

At a round table, n persons are seated on n chairs. The probability that two friends from same college are sitting next to each other, is:

For a distribution with mean, median, mode and standard deviation 25, 24, 26 and 5 respectively, Karl Pearson's coefficient of skewness equals to:

  The standard error of the given data 15, 5, 12, 10, 20, 4 is

Which of the following is the most relevant for deriving a point estimate?

For the two variables X and Y, the following observations are tabulated

The value of k so that following is probability mass function