PSLE The bar graph shows the number of storybooks read by a class from January to April. The number of storybooks read in January is not shown.
- What was the percentage decrease in the number of storybooks read from March to April?
- The average number of books read in a month from January to April was 80. How many books did the class read in January?
(a)
One interval = 1 u
Decrease in the number of storybook reads from March to April
= 10 u - 9 u
= 1 u
Percentage increase in the number of storybooks read from from March to April
=
110 x 100%
= 10%
(b)
Total number of storybooks read from January to April
= 4 x 80
= 320
Number of storybooks read from February to April
= 80 + 100 + 90
= 270
Number of storybooks read in January
= 320 - 270
= 50
Answer(s): (a) 10%; (b) 50