PSLE The bar graph shows the number of storybooks read by a class from February to May. The number of storybooks read in February is not shown.
- What was the percentage decrease in the number of storybooks read from April to May?
- The average number of books read in a month from February to May was 60. How many books did the class read in February?
(a)
One interval = 1 u
Decrease in the number of storybook reads from April to May
= 5 u - 4 u
= 1 u
Percentage increase in the number of storybooks read from from April to May
=
15 x 100%
= 20%
(b)
Total number of storybooks read from February to May
= 4 x 60
= 240
Number of storybooks read from March to May
= 80 + 50 + 40
= 170
Number of storybooks read in February
= 240 - 170
= 70
Answer(s): (a) 20%; (b) 70