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 90. 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 - 9 u
= 1 u
Percentage increase in the number of storybooks read from from May to June
=
110 x 100%
= 10%
(b)
Total number of storybooks read from March to June
= 4 x 90
= 360
Number of storybooks read from April to June
= 100 + 100 + 90
= 290
Number of storybooks read in March
= 360 - 290
= 70
Answer(s): (a) 10%; (b) 70