Question

The number of hours a group of contestants spends preparing for a quiz show is listed below. What is the frequency table that represents that data?
8 12 25 32 45 50 62 73 80 99 4 18 9 39 36 67 33

Answer 1

I'll just show you how to make a frequency table using the above data. 
We will group the data into class intervals and determine the frequency of the group.

8 12 25 32 45 50 62 73 80 99 4 18 9 39 36 67 33

smallest data value = 4
highest data value = 99
difference = 99 - 4 = 95
number of data = 17

Let us assign a class interval of 20.

Class Interval     Tally                              Frequency
0-20                    8, 12, 4, 18, 9,                     5
21-40                25, 32, 39, 36, 33                 5 
41-60                45, 50, 67                              3
61-80                62, 73, 80                              3
81-100              99                                           1

That is how a frequency table look like. Usually, under the Tally column, tick marks are written instead of the numbers but for easier monitoring, I used the numbers in the data set.