Question

Find the mean: 89, 70, 79, 77, 74, 74,79, 90, 87.

Answer 1

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 =

`\frac{89\text{ + 70 +79 +77 + 74+74 +79 + 90+87}}{9}`
`\begin{gathered} =(719)/(9) \\ =79.8888889 \\ \approx\text{ 79.89 \lparen correct to 2 decimal places\rparen} \end{gathered}`

CONCLUSION:

The mean = 79. 89 ( correct to 2 decimal places)