Question

The scores on the test for a sample of 39 students are summarized in the following table. Fine the mean score. Round your answer to at least one decimal place

Answer 1

To find the mean of the sample we will sum all the scores and divide by the number of students, therefore

`\begin{gathered} \text{ mean }=(9\cdot90+18\cdot80+12\cdot70)/(39) \\ \end{gathered}`

Now, let's use a calculator to solve it, we get

`\text{mean }=(3090)/(39)`

And then

`\text{ mean = }79.23`

Therefore, the mean of the sample is 79.23