Question

Calculate the mean and median for the set of numbers:
12,88,89,90

Answer 1

Mean: 69.75

Median: 88.5

Explanation:

To find the mean of these four numbers add them together and divide by the # of numbers there are. (4)

(12 + 88 + 89 + 90)/4

(100 + 89 + 90)/4

(100 + 179)/4

279/4

The mean of this set is 69.75.

To find the median of a set with an even amount of numbers, find the two numbers in the middle, add them, and divide by 2.

(88 + 89)/2

177/2

The median of this set is 88.5.

Answer 2

Median: 88.5

Mean: 69.75

Explanation:

Mean: add all numbers and divide by the amount of numbers.

Median: find the center most number. If none exist, take the two center most numbers and divide them by 2.

Mean: 12+88+89+90

279/4

69.75

Median:

(88+89)/2

177/2

88.5