The mean and standard deviation of two numbers are 10 and 2 respectively. Find the numbers.

The mean and standard deviation of six observations are 8 and 4, respectively. If each observation is multiplied by 3, find the new mean and new standard deviation of the resulting observations

The mean and standard deviation of observations are 8 and 14 respectively. If each observation be multiplied by 3, the find the new and mean and new standard deviation of the resulting observation.

Show that the arithmetic means of two positive numbers can never be less than their geometric mean. The arithmetic and geometric means of two positive numbers are 15 and 9 respectively. Find the numbers.

Sum and product of mean and standard deviation of a bionomial distribution are 24 and 128 respectively. Find the distribution.

A student obtained the mean and standard deviation of 100 observations as 40 and 5.1 respectively. It was later found that he had wrongly copied one observation as 50, the correct figure being 40. Calculate the correct mean and correct standard deviation.

Calculate the mean and standard deviation of the numbers-natural numbers .

The arithmetic mean and standard deviation of 7 observations are respectively 8 and 4.If five of the observations are 2,4,10,12 and 14 then find the values of the remaining two

The arithmetic mean and standard deviation of 7 observations are respectively 8 and 16. If five of the observations are 2, 4, 10, 12 and 14 then find the values of the remaining two.

The standard deviation of first 10 natural numbers is