The graph shows the number of non-fiction books borrowed by visitors at the local library on a Friday.
- How many visitors visited the local library that Friday?
- What was the average number of non-fiction books borrowed by each visitor that Friday? Give your answer to the nearest whole number.
(a)
Total number of visitors
= 138 + 16 + 77 + 74 + 55
= 360
(b)
Total number of non-fiction books borrowed
= 5 x 138 + 6 x 16 + 7 x 77 + 8 x 74 + 9 x 55
= 690 + 96 + 539 + 592 + 495
= 2412
Average number of non-fiction books borrowed
= 2412 ÷ 360
= 6.7
≈ 7
Answer(s): (a) 360; (b) 7