From the following data, relating to playing habits in various age group of 900 students . Calculate cor=efficient of correlation between age group and playing habits:

Following data relates to age group and percentage of regular players. Calculates Karl Pearson's coefficient of correlation .

From the following data. Find the probability of selecting 'B' blood group student .

Following data gives age of 100 students in a college. Calculate variance and S.D.

The followings data give the number of boys of a particular age in a class of 40 students Calculate the mean age of the students.

Number of persons in various age groups in a town is given in the following table: Which two age groups have same population ?

Number of students from various school playing various games is given in following table What is the difference between the average number of students playing cricket from all school and the average number of students playing tennis from all schools ?

Following is the age distribution of a group of students. Draw the cumulative frequency polygon, cumulative frequency curve (less than type) and hence obtain the median value.