Find the class-mark of the class $35-40.$

Complete the following table.

In a ‘tree plantation’ project of a certain school there are $45$ students of 'Harit Sena'. The record of trees planted by each student is given below:$3, 5, 7, 6, 4, 3, 5, 4, 3, 5, 4, 7, 5 , 3, 6, 6, 5, 3, 4, 5, 7, 3, 5, 6, 4, 4, 3,5, 6, 6, 4, 3, 5, 7, 3, 4, 5, 7, 6, 4, 3, 5, 4, 4, 7.$

The value of$\pi$ up to $50$ decimal places is given below :

$3.14159265358979323846264338327950288419716939937510$

In the table given below, class-mark and frequencies are given. Construct the frequency tables taking inclusive and exclusive classes.

In the table given below, class-mark and frequencies are given. Construct the frequency tables taking inclusive and exclusive classes. 

In a school, $46$ students of $9\mathrm{th}$ standard, were told to measure the lengths of the pencils in their compass-boxes in centimetres. The data collected was as follows.

$16, 15, 7, 4.5, 8.5, 5.5, 5, 6.5, 6, 10, 12,13, 4.5, 4.9, 16, 11, 9.2, 7.3, 11.4, 12.7, 13.9, 16,5.5, 9.9, 8.4, 11.4, 13.1, 15, 4.8, 10, 7.5, 8.5, 6.5,7.2, 4.5, 5.7, 16, 5.7, 6.9, 8.9, 9.2, 10.2, 12.3, 13.7,14.5, 10$

By taking inclusive classes$0-5, 5-10, 10-15...$.prepare a grouped frequency distribution table.

In a village, the milk was collected from $50$ milkmen at a collection centre in litres as given below :

$27, 75, 5, 99, 70, 12, 15, 20, 30, 35, 45, 80,77, 90, 92, 72, 4, 33, 22, 15, 20, 28, 29, 14,16, 20, 72, 81, 85, 10, 16, 9, 25, 23, 26, 46,55, 56, 66, 67, 51, 57, 44, 43, 6, 65, 42, 36,7, 35.$

By taking suitable classes, prepare a grouped frequency distribution table.