Following are the weights (in $\mathrm{kg}$) of $20$ boys of a class. Group the data into classes $40$ - $43, 43$ - $46$, etc.

$43.0, 49.2, 48.5, 46.0, 47.6, 47.4, 51.0, 53.1, 54.0, 42.5, 40.7, 44.2, 56.3, 37.1,49.0, 48.1, 40.9, 45.4, 56.4, 53.5$

The daily earnings of $35$ medical stores (in $₹$) are as follows:

Prepare a frequency distribution table taking equal class size, with intervals $50$ - $100$ ($100$ not included).

A test was given to a group of $35$ students for a job. The time taken (in min) by the students to complete the test was:

$$\begin{gathered} 35, 30, 40, 27, 28, 44, 32, 43, 40, 25, 27, 48, 49, 47, 37, 38, 43, 41, 42, 32, 31, 48, 49, 34, 32, 35, \\ 45, 44, 40, 40, 27, 39, 48, 35, 41 \end{gathered}$$

Prepare a grouped frequency table for this data taking intervals $25$ - $30, 30$ - $35$ and so on.

Construct a frequency distribution table of class size $10$ for the following data:

$$\begin{gathered} 22, 11, 28, 15, 10, 7, 5, 21, 35, 42, 31, 29, 16, 24, 25, 12, 10, 18, 11,14, 6, \\ 3, 8, 11, 23, 25, 33, 45, 16, 49, 35, 14, 9, 22, 11, 15, 27, 30, 19, 8 \end{gathered}$$

The pulse rate (per min) of  persons was recorded as given below:

$$\begin{gathered} 61, 76, 72, 73, 71, 66, 78, 73, 68, 81, 78, 63, 72, 75, 80, 68, 75, 62, 71, 81, \\ 73, 60, 79, 72, 73, 74, 71, 64, 76, 71 \end{gathered}$$

Construct a frequency table using class intervals of equal width, one class interval being $60$ - $65$.

Study the following bar graph and answer the question:

What is the information given in the double bar graph?

Study the following bar graph and answer the question:

In which subject has the performance improved the most?

Study the following bar graph and answer the questions that follow:

In which subject has the performance deteriorated?

Study the following bar graph and answer the questions that follow:

In which subject is the performance at par?