Finding The

Mean

BEGIN………Mrs. LeCrone

Rm 205 All clip art courtesy of Microsoft Clip Art Gallery

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MEAND

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• The mean is the arithmetic average of a set of values (http://en.wikipedia.org/wiki/Mean)

Mean

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• You can find the mean of a set of data by finding the sum of the numbers you have and dividing by the amount of numbers you have.

Set of numbers: 5, 7, 7, 10, 12, 14, 155+7+7+10+12+14+15= 70

70/7=10 Mean=10

Mean

7 numbers

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Mean ActivityMary wants to know how high she can jump. She realizes that she can’t rely on just one jump so she decides to record how high she jumps each of 15 times. The following is a graph she made to record her data:

67

66

65

64

63

62

61

60

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

What is the first step in calculating Mary’s MEAN Jumping height?

Find the height she jumped most often

Add up all of the heights she jumped

Put her jump heights in an ordered list

67

66

65

64

63

62

61

60

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

63 + 65 + 64 + 66 + 62 + 63 + 64 + 62 + 65 + 67 + 63 + 65 + 62 + 66 + 64

What is the sum of Mary’s jumping heights?

961 inches 820 inches 1052 inches

Correct!

Now that we know the sum is………

What do you do next?

961 inches

Multiply by the number of jumps

Subtract the sum from the highest Jump

Divide the sum by the number of jumps

Correct!

Now we need to divide the sum of all of Mary’s jumps by the number of jumps she attempted.

What will this problem look like?

961 ÷ 15 = 15 ÷ 961 = 961 – 15 =

Correct!

Now that we know that961 ÷ 15 = 64.06

we can make some conclusions about Mary’s jumping height.

Use activity to write three OBSERVATIONS you can make about Mary’s Jumping height.

Nice Job

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