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 45. 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
= 5 u - 4 u
= 1 u
Percentage increase in the number of storybooks read from from March to April
=
15 x 100%
= 20%
(b)
Total number of storybooks read from January to April
= 4 x 45
= 180
Number of storybooks read from February to April
= 50 + 50 + 40
= 140
Number of storybooks read in January
= 180 - 140
= 40
Answer(s): (a) 20%; (b) 40