Find the missing value of p for the following distribution whose mean is 12.58.

Following are the lives in hours of 15 pieces of the components of aircraft engine. Find the median:

715, 724, 725, 710, 729, 745, 694, 699, 696, 712, 734, 728, 716, 705, 719

The shirt sizes worn by a group of 200 persons, who bought the shirt from a store, are as follows:

Find the modal shirt size worn by the group.

The following is the distribution of height of students of a certain class in a certain city.

Find the median height.

Find the mean from the following frequency distribution of marks at a test in statistics: