Question

the mean of a set of 12 numbers is 5 and the mean of a different set of 8 numbers is a. given that the combined set of twenty numbers is 8, find the value of a​

Answer 1

Unit 5 Section 2 : Mean, Median, Mode and Range
The mean, median and mode are types of average.
The range gives a measure of the spread of a set of data.

This section revises how to calculate these measures for a simple set of data.
It then goes on to look at how the measures can be calculated for a table of data.

Calculating the Mean, Median, Mode and Range for simple data
The table below shows how to calculate the mean, median, mode and range for two sets of data.
Set A contains the numbers 2, 2, 3, 5, 5, 7, 8 and Set B contains the numbers 2, 3, 3, 4, 6, 7.