The grades on a chemistry exam for a sample of 30 students are as follows:

(a) Construct the stem and leaf plot for these data using 10’s as the stems.

(b) Find the median, first quartile and the third quartile for these data.

Solution: (a) We get

(b) We have the following summary:

This means that the median is m = 68, the first quartile is Q1 = 58, and the third quartile is Q3 = 79.

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