This is Mean Median Mode Range Calculate the data and find the mean.

21, 17, 21, 25, 23, 13

the mean is 20

Explanation: To find the mean, you add all the numbers of the data set. (21+17+21+25+23+13) = 120. Then when you have that answer, you divide it by how many numbers are in the data set (6 numbers). So then it would be 120 divided by 6 = 20.

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whole numbers.

step-by-step explanation:

we are given the average monthly rainfall (in millimeters) model r(m) for the years 1900-2009 as a function of the month number m.

as we can see m is taken for the number of months for years 1900-2009.

we know that number of months can't be a negative number or decimal number or a fraction.

so, the number of months could be only positive whole numbers.

therefore, whole numbers is more appropriate for the domain of r.