[" 51.If the mean and variance of eight numbers "3,7,9,12,13" ,"],[20,x" and "y" be "10" and "25," respectively,then "x*y" is equal to "]

If the mean and variance of six observations 7,10, 11, 15 a, b are 10 and (20)/(3), respectively, then value of |a-b| is equal to :

If the mean and variance of the following data: 6, 10, 7, 13, a, 12, b, 12 are 9 and (37)/(4) respectively, then (a-b)^(2) is equal to

Find the mean and variance for each of the data : 6,7,10,12,13,4,8,12

Find the mean and variance for each of the data : 6,7,10,12,13,4,8,12

Find the mean and variance for the following data 6,7,10,12,13,4,8,12

Let the mean and variance of four numbers 3, 7, x and y (x gt y) be 5 and 10 respectively. Then the mean of four numbers 3 + 2x, 7 + 2y, x + y and x - y is ___ _

The mean and variance for the data 6,7,10,12,13,4,8,12 respectively are

If mean and variance of 2, 3, 16, 20, 13, 7, x, y are 10 and 25 respectively then find xy

If mean and variance of 2, 3, 16, 20, 13, 7, x, y are 10 and 25 respectively then find xy

Find the mean and variance for each of the data in 6, 7, 10, 12, 13, 4, 8, 12