Mean and Median

Math 

MEAN

• The mean is a synonym for average.

MEAN

• To find the mean (average) of a group of numbers the first step is to add all of the numbers.

Example: 4, 10, 3, 7, 2, 10

4 + 10 + 3 + 7 + 2 + 10 = 36

MEAN

• After you have added all of the numbers, the next step is to divide the sum by the total number of addends.

• Example:

36/6 = 6

• Mean = 6

MEAN

• Note: sometimes, you do not get a whole number.

MEAN

• Now, you try one!

• 7, 9, 11, 6, 13, 6, 6, 3, 11

• What is the first step?

MEAN

• 7 + 9 + 11 + 6 + 13 + 6 + 6 + 3 + 11 = 72

• What is the next step?

MEAN

• Divide• 72/9 = 8• Mean = 8• Now, let’s try 1 more!

MEAN

•Find the mean for this group of numbers.

•11, 10, 24, 16, 14

MEAN

•11 + 10 + 24 + 16 + 14 = 75

MEAN

•75/5 = 15

•Mean = 15

MEDIAN

• The median is the middle number or value.

• To find the median the first step is to put the numbers in order from least to greatest.

MEDIAN

• The number in the middle of the list is the median.

MEDIAN

• 4, 23, 16, 17, 6, 10, 20

• Put the numbers in order from least to greatest.

MEDIAN

• 4, 6, 10, 16, 17, 20, 23

• Median = 16

MEDIAN

•Now you try one!

•What is the median of

5, 11, 23, 9, 10

MEDIAN

•5, 9, 10, 11, 23

•Median = 10

MEDIAN• 6, 3, 7, 6, 11, 13, 6, 11, 9

• Put the numbers in order from least to greatest.

MEDIAN

•3, 6, 6, 6,

7, 9, 11, 11, 13

•Median = 7

MEDIAN

• If there are two middle values, the median is halfway between them.

MEDIAN• 13, 7, 6, 8, 6, 3, 11, 6, 11, 9

• Put the numbers in order

MEDIAN

•3, 6, 6, 6, 7, 8, 9, 11, 11, 13

• There are two middle numbers or values, 7 and 8. The median is halfway between 7 and 8. The median is 7 ½ or 7.5.