R Chandra Solutions for Chapter: Statistics, Exercise 1: TEST YOUR SKILLS

Find the mean of the marks obtained by $30$ students of class $\mathrm{I}\mathrm{X}$ of a school. The marks are:
$\begin{array}{cccccccccc}10& 20& 36& 92& 95& 40& 50& 56& 60& 70\\ 92& 88& 80& 70& 72& 70& 36& 40& 36& 40\\ 92& 40& 50& 50& 56& 60& 70& 60& 60& 88\end{array}$

 Find the mean of the following data:

Find the value of P when the mean of the following data is $21.6\mathrm{}.$

The heights (in $\mathrm{c}\mathrm{m}$) of $9$ students of a class are as follows:
$155,\mathrm{}160,\mathrm{}145,\mathrm{}149,\mathrm{}150,\mathrm{}147,\mathrm{}152,\mathrm{}144,\mathrm{}148$
Find the median of this data.

The following table gives a description of the marks obtained by $41$ students of a class:

The points scored by the team of kabaddi in a series of matches are as follows:
$17,\mathrm{}2,\mathrm{}7,\mathrm{}27,\mathrm{}15,\mathrm{}5,\mathrm{}14,\mathrm{}8,\mathrm{}10,\mathrm{}24,\mathrm{}48,\mathrm{}10,\mathrm{}8,\mathrm{}7,\mathrm{}18,\mathrm{}28$
Find the median of the points scored by the team.

Find the mode of the following marks (out of $10$) obtained by $20$ students:
$\begin{array}{cccccccccc}4,& 6,& 5,& 9,& 3,& 2,& 7,& 7,& 6,& 5\\ 4,& 9,& 10,& 10,& 3,& 4,& 7,& 6,& 9,& 9\end{array}$

In a small unit of a factory $5$ employees (a supervisor and four labourers) are working. The labourers draw a salary of $5000$ per month each while the supervisor gets $\mathrm{₹}\mathrm{15,000}$ per month. Calculate the mean, median and mode of the salaries of the unit of the factory.