Introduction to Data Handling

Julian runs a bookshop. The table shows the number of books purchased by each of his last $25$ customers. 

Calculate the median number of books purchased by these customers. 

Write any two advantages of recording data in right format

Twenty-Five cards were picked up from a pack of cards one by one. The cards picked up are as follows:
Spade, Club, Spade, Club, Spade, Spade, Club, Diamond, Heart, Club, Diamond, Club, Diamond, Club, Diamond, Spade, Diamond, Club, Spade, Diamond, Heart, Diamond, Heart, Club, Heart
What is the frequency of diamond?

Number of people in various age groups in a town is given in the following table:

How many senior citizens are there in the town?

Number of people in various age groups in a town is given in the following table:

How many age groups have the same population?

A study was done to collect data on the amount of homework required from students at a school in Canada.

Year 3 students in a school were asked for their grade in a science class, and about the use of their cell phone in the class.

Explain how this data would impact your use of a cell phone in class.

Year 3 students in a school were asked for their grade in a science class, and about the use of their cell phone in the class.

Propose an explanation for the trends you see in the data.

Year $3$ students in a school were asked for their grade in a science class, and about the use of their cell phone in the class.

What trends do you see in the data? Justify your answer.

Year $3$ students in a school were asked for their grade in a science class, and about the use of their cell phone in the class.

Draw any type of graph to represent the data. Discuss the effectiveness of graph.

This chart was used in an article that claimed, 'High school graduation rates have increased dramatically under new government!'

Explain whether you think the claim is justified from the graph or not.

The number of story books read by $4$ friends in a year is as follows. Show the tally marks for the number of books read, for each friend.

Manish: $16$  Alka: $22$  Ayesha: $14$  Harjit: $18$

The final marks obtained in Mathematics by $40$ students are as follows:

$\begin{array}{l}60\\ 100\\ 68\\ 60\\ 61\\ 62\\ 39\end{array}$   $\begin{array}{l}56\\ 48\\ 58\\ 37\\ 88\\ 75\\ 68\end{array}$   $\begin{array}{l}90\\ 39\\ 59\\ 64\\ 58\\ 82\\ 50\end{array}$   $\begin{array}{l}50\\ 70\\ 98\\ 52\\ 44\\ 61\\ 52\end{array}$   $\begin{array}{l}62\\ 60\\ 84\\ 77\\ 75\\ 19\\ \end{array}$   $\begin{array}{l}67\\ 55\\ 78\\ 48\\ 53\\ 49\\ \end{array}$

What is the range?

Kate made a tally table of the ice-cream cones sold to Kate’s Ice-Cream Parlour during a weekend in May. Use the given data to draw a pictograph.

(scale:  = 5)

Ms Jennifer collected data from the students of class V on their favourite animals. She presented the same using tally marks.