A K Upadhyay and S Upadhyay Solutions for Chapter: Statistics, Exercise 2: EXERCISE

The average score of boys in an examination of a school is $77$ and that of girls is $75$. The average score of the school in that examination is $76.5$. Find the ratio of the number of boys to the number of girls that appeared in the examination.

The marks obtained by $80$ students in a test are given below:

Find the modal marks.

The points scored by a basketball team in a series of matches are as follows:

$17, 2, 7, 27, 25, 5, 14, 18, 10, 24, 10, 8, 7, 10$

Find median of the data.

Find the mode of the following data.

$4, 14, 6, 9, 6, 14, 9, 21, 21, 25, 21, 14, 29, 21, 8, 6$

On a particular day, number of shoes sold by a shoe store are given in the following data:

The set of data $3, 5, 6, x, 6, 5$ is given. In each part find a possible value of $x$ so that there is no mode because all scores appear an equal number of times.

In class $\mathrm{IX}$ examination of a school $98$ boys and $46$ girls appeared. The mean marks of the boys was found to be $60\%$ and that of the girls was $40\%$. Determine the average marks (percentage) of the school.

The mean of $10$ observations is $20$. The mean of first six observations is $18$ and that of last six observations is $21$. The fifth observation is $12$. Find the sixth observation.