The is the average of a set of given numbers or data.
It can be found by adding all the numbers/data together and then dividing it by the number of items in the set. Which can also be represented by the equation;
![\operatorname{mean}=\frac{Sum\text{ of all the data}}{\text{Number of Data}}]()
So for our question we have the grades 62, 78, 59 and 89. All in all we have 4 grades.
In order for us to find the mean we must first add all our grades together, so we have;
Now that we have the total of the grades which is 288, we will now divide it by the number of grade there is (which is 4) in order to find the mean.
![\operatorname{mean}=(288)/(4)=72]()
Therefore our MEAN is 72.
And now we can say that the average grade that Carl have in all 4 math test is 72.