You need to remember the formula of mean of numerical elements such that:

Mean = sum of elements/the number of elements

Mean = `(15 +20 + 25 + 30 + 35 + 40 + 45 + 50 + 55)/9`

Mean = 35

Notice that the mean is the middle numerical element 35.

You need to remember that the median is the middle term, hence, because you don't need to put the numbers is order, you may tell that the median = 35. Notice that mean = median = 35.

Notice that there is no mode since each number appears just once.

**Hence, the mean is equal to median = 35 and there is no mode for the list of numbers 15, 20, 25, 30, 35, 40, 45, 50, 55.**

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