### Home > CALC > Chapter 11 > Lesson 11.2.4 > Problem 11-85

11-85.

The table below shows the rate of books being checked out (in books per hour) from the local library at various times (in hours) during the day. Homework Help ✎

time

*t*0

1

2

3

4

5

6

7

rate

*b'*16

39

47

68

81

77

85

62

About how many books were checked out during the day?

What was the average rate of books being checked out?

This is the area under *b*′.

You computed the total books check out in part (a).

What is the total number of hours?