Question

the travel time to work of people from a survey are 9, 13, 16, 18, 21, 27, 30, 33, 38, 44, 49, 52, 55. put this data into the frequency table below.
time (minutes) | frequency
1 - 10 | 1
11 - 20 |?
21 - 30 | 3
31 - 40 |
41 - 50 | 2
51 - 60 |

Explanation:

Step1: Identify data in 11 - 20 range

The data values 13, 16, 18 are in the 11 - 20 range.

Step2: Count the number of values

There are 3 values in the 11 - 20 range.

Step3: Identify data in 31 - 40 range

The data values 33, 38 are in the 31 - 40 range. So the frequency for 31 - 40 is 2.

Step4: Identify data in 51 - 60 range

The data values 52, 55 are in the 51 - 60 range. So the frequency for 51 - 60 is 2.

Answer:

Time (Minutes)	Frequency
11 - 20	3
21 - 30	3
31 - 40	2
41 - 50	2
51 - 60	2