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: Count for 11 - 20

Count the numbers in the range \(11 - 20\). The numbers \(13,16,18\) are in this range. So the frequency is \(3\).

Step2: Count for 31 - 40

Count the numbers in the range \(31 - 40\). The numbers \(33,38\) are in this range. So the frequency is \(2\).

Step3: Count for 51 - 60

Count the numbers in the range \(51 - 60\). The numbers \(52,55\) are in this range. So the frequency is \(2\).

Answer:

For \(11 - 20\): \(3\); For \(31 - 40\): \(2\); For \(51 - 60\): \(2\)