PSLE The bar graph shows the number of storybooks read by a class from July to October. The number of storybooks read in October is not shown.
- What was the percentage increase in the number of storybooks read from July to August?
- The average number of books read in a month from July to October was 80. How many books did the class read in October?
(a)
One interval = 1 u
Increase in the number of storybooks read from July to August
= 10 u - 4 u
= 6 u
Percentage increase in the number of storybooks read from July to August
=
64 x 100%
= 150%
(b)
Total number of storybooks read from July to October
= 4 x 80
= 320
Number of storybooks read from July to September
= 40 + 100 + 90
= 230
Number of storybooks read in October
= 320 - 230
= 90
Answer(s): (a) 150%; (b) 90