EXERCISE 3.1

The rainfall (in $\mathrm{mm}$) in a city on $7$ days of a certain week was recorded as follows:

If the range of rainfall in the above data is $\mathrm{M} \mathrm{mm}$, then find the value of $\mathrm{M}$.

The rainfall (in $\mathrm{mm}$) in a city on $7$ days of a certain week was recorded as follows:

The rainfall (in $\mathrm{mm}$) in a city on $7$ days of a certain week was recorded as follows:

On how many days was the rainfall less than the mean rainfall.

The heights of $10$ girls were measured in $\mathrm{cm}$ and the results are as follows:

$135, 150, 139, 128, 151, 132, 146, 149, 143, 141$

If the height of the tallest girl is $k \mathrm{cm}$, then find the value of $k$.

The heights of $10$ girls were measured in $\mathrm{cm}$ and the results are as follows:

$135, 150, 139, 128, 151, 132, 146, 149, 143, 141$

If the height of the shortest girl is $k \mathrm{cm}$, then find the value of $k$.

The heights of $10$ girls were measured in $\mathrm{cm}$ and the results are as follows:

$135,\mathrm{}150,\mathrm{}139,\mathrm{}128,\mathrm{}151,\mathrm{}132,\mathrm{}146,\mathrm{}149,\mathrm{}143,\mathrm{}141.$

If the range of the data is $k \mathrm{cm}$, find the value of $k$.

The heights of $10$ girls were measured in $\mathrm{cm}$ and the results are as follows:

$135,\mathrm{}150,\mathrm{}139,\mathrm{}128,\mathrm{}151,\mathrm{}132,\mathrm{}146,\mathrm{}149,\mathrm{}143,\mathrm{}141.$

If the mean height is $k \mathrm{cm}$, then write the value of $k$ as final answer. 

The heights of $10$ girls were measured in $\mathrm{cm}$ and the results are as follows:

$135,150,139,128,151,132,146,149,143,141$.

How many girls have heights more than the mean height?