Question

the ages of people in a library on a given day are: 11, 17, 32, 44, 45, 45, 48, 48, 53, 53, 55, 69. put this data into the frequency table below.
ages | frequency
11 - 20 | 2
21 - 30 | ?
31 - 40 | 1
41 - 50 |
51 - 60 | 3
61 - 70 |

Explanation:

Step1: Count for 21 - 30

No values in this range, so frequency is 0.

Step2: Count for 41 - 50

Values 44, 45, 45, 48, 48 are in this range, so frequency is 5.

Step3: Count for 61 - 70

Value 69 is in this range, so frequency is 1.

Answer:

Ages	Frequency
21 - 30	0
31 - 40	1
41 - 50	5
51 - 60	3
61 - 70	1