NCERT Solutions for Chapter: Data Handling, Exercise 1: Exercise

In a class, there are $30$ boys and $20$girls. The average weight of $30$ boys is $60 kg$ and the average weight of $20$ girls is $35 kg$. Find the average weight of the class.

There are $20$ students in a class. Of them the height of ten students is $150 \mathrm{cm}$ each, then height of $6$ students is $142 \mathrm{cm}$ each and the height of $4$ students is $132 \mathrm{cm}$ each. Find the average height of all the students

A class has $15$ students in which $5$ are boys and $10$ are girls. The mean weight of all the boys is $45$ kg and that of all the girls is $42$ kg. Find the mean weight of all the students of the class.

The mean of $p, q$ and $r$ is same as the mean of $q, 2r$ and $s$. Then which of the following is correct?

The range of a data is $x$, the median and the mode of the data is $7$ each. If the number of observations is odd and all observations are integers, then find the least value of $x$ (range $\ne 0$).

The range of the data $15, 18, 17, 16, 14, x, 12, 10, 9, 15\text{ is} 9$. Which of the following is true about $x?$

Construct a data set with eight items so that the mean is $4$, the median is $3$ and the mode is  $2$

Find the mode of the following data

$4, 3, 5, 11, 4, 7, 5, 4$