PSLE The bar graph shows the number of storybooks read by a class from September to December. The number of storybooks read in December is not shown.
- What was the percentage increase in the number of storybooks read from September to October?
- The average number of books read in a month from September to December was 65. How many books did the class read in December?
(a)
One interval = 1 u
Increase in the number of storybooks read from September to October
= 9 u - 3 u
= 6 u
Percentage increase in the number of storybooks read from September to October
=
63 x 100%
= 200%
(b)
Total number of storybooks read from September to December
= 4 x 65
= 260
Number of storybooks read from September to November
= 30 + 90 + 40
= 160
Number of storybooks read in December
= 260 - 160
= 100
Answer(s): (a) 200%; (b) 100