World Water Day is celebrated every year

Completely randomized design is based on the principles of _________ and randomization only.

Five persons A, B, C, D and E occupy seats in a row at random. The probability that A and B sit next to each other is:

The second quartile for the following data 38, 39, 40, 52, 59, 67, 73, 77, 149, 248 is:

The arithmetic mean of the following frequency distribution of number of accidents X on week working days is:

The variation among the observations of each specific class is known as:

For the following frequency distribution

If the first, second and third moment about origin are 2, 8 and 14. respectively, then Karl Pearson gamma coefficient of skewness y1 is:

Following two statements are related to regression coefficient

(I) Independent of the change of origin

(II) Independent of the change of scale

The memory-less property is followed by which of the following continuous distribution: