Mean, Median, Mode, Range, Interquartile Range

Mean, Median, Mode, Range & IQR-1

You will need pencil, paper and a calc for this lesson!!!!

MEAN

• The MEAN is the AVERAGE. You find the AVERAGE by adding up all the numbers and then divide by the number of numbers. 

Multiple Choice

What number would you divide by to calculate the mean of 3, 4, 5, and 6?

• 6

• 3

• 5

• 4

Multiple Choice

What is the mean of the following numbers? 10, 39, 71, 39, 76, 38, 25

• 42

• 39

• 42.5

• 35.5

MEDIAN

The MIDDLE number in a set of data.

Multiple Choice

• 21

• 45

• 58

• 61

Multiple Choice

What is the median of the following numbers? 10, 39, 71, 42, 39, 76, 38, 25?

• 39

• 38

• 42

• 25

MODE

• The mode is the number that is repeated the MOST.

Fill in the Blanks

Multiple Choice

Find the mode from these test results: 90, 80, 77, 86, 90, 91, 77, 66, 69, 65, 43, 65, 75, 43, 90.

• 43

• 77

• 65

• 90

RANGE

• The largest value in the list is 21, and the smallest is 13, so the range is 21 – 13 = 8.

Multiple Choice

What is the range of the following set of numbers: 36, 17, 22, 43, 11, 56, 17, 71

• 45

• 54

• 60

• 49

Interquartile Range

The interquartile range describes how close the middle half of the values are to the median.

Last week’s quiz scores were 84%, 92%, 76%, 100%, 50%, 95%, and 89%. What was the interquartile range for the quiz scores?

Rewrite the scores in numerical order.

50, 76, 84, 89, 92, 95, 100.

• 89 is in the middle, so that represents our median .

• The lower quartile is in the middle of the bottom three, 76

• The upper quartile is the middle value of the upper three, 95.

• The Interquartile range is 95-76=19

Multiple Choice

What is the IQR of the following data set:

4, 5, 6, 8, 9, 10, 11

• 5

• 6

• 7

• There is not enough information

Multiple Choice

This gaming system is known as

• Sega

• Super Nintendo

• Nintendo 64

• Odyssey