PSLE The bar graph shows the number of storybooks read by a class from March to June. The number of storybooks read in March is not shown.
- What was the percentage decrease in the number of storybooks read from May to June?
- The average number of books read in a month from March to June was 80. How many books did the class read in March?
(a)
One interval = 1 u
Decrease in the number of storybook reads from May to June
= 10 u - 8 u
= 2 u
Percentage increase in the number of storybooks read from from May to June
=
210 x 100%
= 20%
(b)
Total number of storybooks read from March to June
= 4 x 80
= 320
Number of storybooks read from April to June
= 100 + 100 + 80
= 280
Number of storybooks read in March
= 320 - 280
= 40
Answer(s): (a) 20%; (b) 40