SOLUTION:
Step 1:
In this question, we are meant to find the mean of:
89, 70, 79, 77, 74, 74,79, 90, 87.
Step 2:
The details of the solution are as follows:
The mean of a set of numbers, sometimes simply called the average , is the sum of the data divided by the total number of data.
Here, we have that:
Mean =
[tex]\frac{89\text{ + 70 +79 +77 + 74+74 +79 + 90+87}}{9}[/tex][tex]\begin{gathered} =\frac{719}{9} \\ =79.8888889 \\ \approx\text{ 79.89 \lparen correct to 2 decimal places\rparen} \end{gathered}[/tex]CONCLUSION:
The mean = 79. 89 ( correct to 2 decimal places)
