1. Calculating the mean from a frequency table
Wednesday, 14 November 2018

2. Example
A class of 25 boys were given a test in basic arithmetic. Here are their recorded scores out of 20.
11, 9, 10, 8, 11, 11, 10, 9, 16, 11,
12, 13, 11, 9, 12, 10, 14, 11, 10, 12,
13, 11, 12, 8, 10.
Obtain the mean score for these boys.
Place the results of the 25 boys scores into a frequency table below.

3. 11, 9, 10, 8, 11, 11, 10, 9, 16, 11, 12, 13, 11, 9, 12, 10, 14, 11, 10, 12, 13, 11, 12, 8, 10.
Mark
Tally
Frequency 8 9 10 11 12 13 14 15 16 fx 2 16
274
Mean = 3 27 25 5 50
Mean =
10.96 7 77 4 48 2 26 1 14 1 16
274

4. Example
The table below shows the number of passengers in each of 40 taxis leaving Burnley town centre one day.
Find the mean number of passengers
No. Of passengers in a taxi 1 2 3 4
No. of taxis 15 16 7

5. Find the mean score per throw
Example
A six sided die was thrown 50 times. The table gives the number of times each score was obtained.
Score 1 2 3 4 5 6
Frequency 7 8 10 12
Find the mean score per throw