Write the less than and greater than cumulative frequencies for the following data.

Class interval	$1‐10$	$11‐20$	$21‐30$	$31‐40$	$41‐50$
Frequency	$4$	$7$	$12$	$5$	$2$

A survey regarding the heights (in cm) of $51$ girls of Class X of a school was conducted and the following data as obtained"

Find the median height.

The cumulative frequency of the class $20-30$ of the above frequency distribution is _____.

Write mid-value of the following frequency distribution.

Find the value of $x$ in following table.

The table below shows, children of a class sorted according to their marks in an examination.

If we arrange the children from the one with the least mark to the one with the greatest, then what will be the assumed mark of the ${12}^{\text{th}}$ student?

The given table represents the exports (in ₹ crores) of four items A, B, C and D over a period of six years. Study the table and answer the question that follows.

In which year, the exports of item $\mathrm{D}$ were $1.4 \mathrm{times}$ the average exports of item $\mathrm{B}$ during six years;

Write less than cumulative frequency and greater than cumulative frequency table for the following data.

In how many cases $4$ or more accidents occur ?

The given table represents the exports ( in$₹$crores) of four items $\mathrm{A}, \mathrm{B}, \mathrm{C}$ and $\mathrm{D}$ over a period of six years. Study the table and answer the question that follows:

The total exports of item $\mathrm{A}$ from $2012$ to $2014$ is what percentage less than the total exports of all the four items in $2015$:(Correct to one decimal place)

The following table gives the frequency of vowels used in the page of a book.