Statistics: Standard Deviation

How do you find the median of a data set that has two middle numbers?

• You pick the higher middle number

• You pick the lower middle number

• Add the two middle numbers and divide it by 2

• Subtract the two middle numbers and divide by 2

The mean of this data set is 17.8. What would happen to the mean if 40 was added to the data set?

• The mean would not change

• The mean would go up

• The mean would go down

Tags

CCSS.HSF-LE.A.1B

What does the standard deviation tell us about the data set?

• How spread out the numbers are

• How much each number in the data set increases by

• How much each number in the data set decreases by

What is normal distribution?

• A symmetrical bell-shaped graph

• A graph that is skewed to the right

• A graph that is skewed to the left

What percent of data lies within 1 standard deviation from the mean?

• 95%

• 99%

• 68%

• 100%

You have a mean of 56 and a standard deviation of 4.3. What is +2 standard deviations from the mean?

• 60.3

• 47.4

• 51.7

• 64.6

The positive standard deviations on a normal distribution curve mean what?

• Below average

• Above average

• Average

The negative standard deviations on a normal distribution curve mean what?

• Below average

• Above average

• Average

What is the standard deviation for the data given:

5, 10, 7, 12, 0, 20, 15, 22, 8, 2

• 6.89

• 10.1

• 7.26

• 9

This data is normally distributed.  What percent of the data is in the shaded region?

• 68%
• 95%
• 99.7%
• 50%