Find the mean for the following frequency distribution

Find the mean and variance for the following frequency distribution.

Find the mean ,standard deviation and coefficient of variation for the following frequency distribution .

Find the standard deviation from the following frequency distribution:

Calculate the mean variance and standard deviation of the following frequency distribution.

Consider the following grouped frequency distribution find the mean of the given data

Consider the following grouped frequency distribution find the C.V. of the given data.

Consider the following grouped frequency distribution find the variance of the given data.

Consider the following grouped frequency distribution find the standard deviation of the given data.

Find the standard deviation for the following distribution :

Calculate mean , variance and standard deviation for the following distribution.