Find mean, variance and S.D. of the following data.

compute variance and S.D. of the following data: 9, 12, 15, 18, 21, 24, 27

Find the variance and S.D. of the following frequency distribution which gives the distribution of 200 plants according to their height.

Find the variance and S.D. for the following set of numbers. : 7, 11, 2, 4, 9, 6, 3, 7, 11, 2, 5, 8, 3, 6, 8, 8, 2, 6

Answer the following : Compute the variance and S.D. for the following data