Marks scored by 30 students of 10th standard in unit test of mathematics is given below. Find the variance of the scores:

The mean and standard deviation of marks obtained by 50 students of a class in three subjects. Mathematics, Physics and Chemistry are given below. Which of the three subject shows the highest variability in marks and which shows the lowest ?

The data regarding marks obtained by 48 students of a class in a class test is given below. Calculate the modal marks of students.

The donations given to an orphanage home by the students of different classes of a secondary school are given below. Find the mean, median and mode of the data.

Centuries scored and number of cricketers in the world are given below. Find the mean, median and mode of the given data.

The runs scored by two teams A and B on the first 60 balls in a cricket match are given below : Represent the data of both the teams on the same graph by frequency polygons.

The average runs scored by a batsman in 15 cricket matches is 60 and standard deviation of the runs is 15. Find the coefficient of variation of the runs scored by him.

A student noted the number of cars passing through a spot on a road for 100 periods each of 3 minutes and summarised it in the table given below. Find the mode of the data.

The following number of goals was scored by a team in a series of 10 matches : 2,3,4,5,0,1,3,3,4,3 Find the mean, median and mode of these scores.

In a college of 30 students fail in physics, 25 fail in mathematics and 10 fail in both. One student is chosen at random. The probability that she fails in physics, if she has failed in mathematics is