Question

joeys first 13 quiz grades in a marking period are listed here. 82, 93, 77, 79, 90, 82, 85, 85, 95, 73, 79, 83, 89. what is the median of the quiz grades? what is the interpretation of the median? the median describes the variability of joeys quiz grades. the median is the same as the average, the sum of the 13 quiz grades divided by 13. the median describes the most common quiz score, the one that occurs the most often. about half of joeys quiz scores are greater than the median, and about half are less.

Explanation:

Step1: Arrange data in ascending order

73, 77, 79, 79, 82, 82, 83, 85, 85, 89, 90, 93, 95

Step2: Find the middle - value

Since there are 13 data points (an odd number), the median is the 7th value. So the median is 83.

Step3: Interpret the median

The median is the middle - value of a data set. About half of Joey's quiz scores are greater than the median, and about half are less.

Answer:

83
D. About half of Joey's quiz scores are greater than the median, and about half are less.