Mean Deviation of a Descrete Frequency Distribution

Find the mean , variance and standard deviation for the frequency distribution.

Find the mean and standard deviation of the following frequency distribution :

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

What is the algebraic sum of deviations of a frequency distribution about its mean?

What is the algebraic sum of deviations of a frequency distribution about its mean?

If the co-efficient variance and standerd deviation of two frequency distribution are 60% and 18, 15 respectively, then find the arithimetic mean of the two frequency distribution.

Calculate the standard deviation of the following frequency distribution :

Calculate the standard deviation of the following frequency distribution :

Find the Variance and Standard deviations of the following frequency distribution: