The mean practice exercises
The problem
A high school teacher gave a history exam to her class of ten students. She graded the papers and recorded the score of each student. She then decided to calculate the mean of these scores.
$X$
19
20
18
13
16
17
20
28
16
18
To calculate the mean we add up all the scores and divide by the number of scores. Here is the formula for the mean.
$$\bar{X} ={\sum{X} \over {n}}$$ $$mean={sum of scores \over number of scores}$$
The solution
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Please calculate the mean and post it as a comment below.
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