A number equal to 4 times of the mean and a frequency equal to k is inserted in the data of n observations. If the new mean is `(7)/(5)` times the old mean, then `(n)/(k)` is equal to

A number equal to 2 times the mean and with a frequency equal to k is inserted in a data having n observation. If the new mean is (4)/(3) times the old mean, then the value of (k)/(n) is

A number equal to 2 times the mean and with a frequency equal to k is inserted in a data having n observation. If the new mean is (4)/(3) times the old mean, then the value of (k)/(n) is

The mean deviation of a frequency dist.is equal to

The mean and variance of 5 observations are 6 and 6.8 respectively. If a number equal to mean is included in the set of observations is k, then the value of (34)/(k) is equal to

The mean and variance of 5 observations are 6 and 6.8 respectively. If a number equal to mean is included in the set of observations is k, then the value of (34)/(k) is equal to

If the mean of first n natural numbers is equal (n+7)/(3) then n is equal to-

If the mean of first n natural numbers is equal to (n+7)/3 , then n is equal to

If the arithmetic mean of two numbers a and b, a>b>0 , is five times their geometric mean, then (a+b)/(a-b) is equal to:

If the mean of n observations 1^2, 2^2, 3^2,….n^2 is (46n)/(11) then n equal to