Find the mean deviation for the following data :

In kurtosis if the frequency curve which is more peaked than the normal curev is called _________ .

For a group of 10 items, $\sum \mathrm{x}=452$ , $\sum {\mathrm{x}}^2=24270$ and mode =43.7 . Find Karl Pearson's coefficient of skewness.

The first two moments of distribution about $\mathrm{a}=5$ are 2 and 20 . Find the mean and the variance.

The coefficient of correlation always lies between ________ .

Find the correlation coefficient between the income and expenditure of a wage earner.

Compute Sperman's rank  correlation coefficient from the following data :

The following table gives the age of car and annual maintenance cost. Find the regression line of cost on age.

In statistical procedure, the skewness is used to measure the _________ .

The coefficient of variance is defined as ___________ .