Find the mean for the following.

$65, 61, 65, 39, 53, 66, 62, 55.$

Rekha obtained the following scores (out of $100$) on a set of maths tests.

$88, 92, 95, 80, 55, 100.$ What is her mean score?

Arun and deepak sat for six tests. Their percentage scores were:

Who has higher mean score.

The heights of $17$ girls were measured ( in cm ) and the results were as follows:

$143, 148, 135, 150, 128, 139, 149, 146, 132, 151, 142, 144, 156, 140, 136, 142, 133.$

What is the height of the tallest girl?

The heights of $17$ girls were measured ( in cm ) and the results were as follows:

$143, 148, 135, 150, 128, 139, 149, 146, 132, 151, 142, 144, 156, 140, 136, 142, 133.$

What is the height of the shortest girl?

The heights of $17$ girls were measured ( in cm ) and the results were as follows:

$143, 148, 135, 150, 128, 139, 149, 146, 132, 151, 142, 144, 156, 140, 136, 142, 133.$

How many girls have height $140 \mathrm{cm}$ or more?

The heights of $17$ girls were measured ( in cm ) and the results were as follows:

$143, 148, 135, 150, 128, 139, 149, 146, 132, 151, 142, 144, 156, 140, 136, 142, 133.$

Find the mean height?