The Director of this after school tutorial center wants to know which age group of students use her center the most to help her plan staffing levels. She selects a random sample of 16 students and obtains the following data on their ages:

.

Ages in years from a random sample of 16 students

at the Downtown After School Tutorial Center

4	8	9	10	11
12	12	13	13	14
15	16	17	18	19	23

When looking at the Frequency Distribution Table, what is the lower x-intercept?

When looking at the Frequency Distribution Table, what is the upper x-intercept?

What is the mean (arithmetic average) for this data set? (round your answer to 4 decimal places).

What is the median for this data set? (report your answer to 4 decimal places)

What is the midpoint of the modal class for this data set? (report your answer to 4 decimal places).

What is the relative frequency of the modal class for this data set? (report your answer to 4 decimal places)

What is the standard deviation for this data set? (round your answer to 4 decimal places)

What is the Coefficient Of Variation for this data set? (Note: COV is a % reported to 2 decimal places, like "12.34%" so remember to use the % sign after the numerical answer.)