13.2.3 Statistics (I), PT3 Focus Practice

Question 7:
Diagram below is an incomplete pictograph showing the sales of books for a duration of five months.


(a) The sales in May is ¼ of the total sales in January and February.
Complete the pictograph in the Diagram.
(b) Find the total number of books sold before April.

Solution:
(a)
$\begin{array}{l}\text{Sales in May}\\ =\frac{1}{4}\times 8\\ =2\end{array}$


(b)
Total number of books sold before April
= (5 + 3 + 6) × 15
= 14 × 15
= 210

Question 8:
Diagram below shows an incomplete line graph of the number of eggs sold in four weeks. The number of eggs sold on week 1 is 2000 and 4000 on week 4.

(a) Complete the line graph in the Diagram.
(b) Complete the pie chart in the second Diagram to represent sales from Week 1 to Week 4.


Solution:
(a)

(b)
$\begin{array}{l}\text{First week}\\ =\frac{2000}{2000+1500+2500+4000}\times {360}^o\\ =\frac{2000}{10000}\times {360}^o\\ ={72}^o\\ \\ \text{Fourth week}\\ =\frac{4000}{10000}\times {360}^o\\ ={144}^o\end{array}$