Empirical Rule / SD

To find Standard Deviation by hand, you start with finding the __________________

• median

• mode

• mean

• deviations

After you have the mean, what do you do with it when finding the standard deviation?

• add it to each number in the data set

• subtract it from each number in the data set

• multiply it from each number in the data set

• divide it from each number in the data set

When finding the standard deviation, what do you do with all the deviations?

• add them up

• square them all

• sit on them

• divide them all

When finding standard deviation, what do you do after you square all the deviations?

• add them up

• square them again ( ALL THE SQQQQUUAAARREEESSS)

• divide them all by 7

• add the mean to them

When finding the standard deviation, what do you do once you have one number to work with?

• Square it and then divide by n-1

• divide by n-1 and then square root it

• square root it and then divide by n-1

• square it and then square root it and then square it again

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CCSS.HSS.ID.A.4

Why is the highest part of the normal curve in the middle?

• Most people tend to fall around the average

• data is never skewed left or right

• when you square things, they always end up in the middle

• the further from the mean, the less likely something is

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CCSS.HSS.ID.A.4

By the way, what is standard deviation?

• how far the mean is from the minimum

• the IQR distance from the average

• average distance that data points are from the mean

• Idk but I should probably find out pretty soon

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CCSS.HSS.ID.A.3

CCSS.HSS.ID.A.4

What percent of people are more than 3 standard deviations above the mean per side?

• .15

• 34

• 68

• 2.35

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CCSS.HSS.ID.A.4

What percent of people are 2 standard deviations or more above the mean?

• 2.35

• 34

• 68

• 2.5

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CCSS.HSS.ID.A.4

What percent of people are within 1 standard deviation of the mean?

• 99.7

• 34

• 68

• 95

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CCSS.HSS.ID.A.4