Statistics Mean Median Mode Standard Deviation

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

Which class has the higher median?

• 1st period

• 2nd period

• They have the same median

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 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

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

Which measure of central tendency would best represent this data?

• Mean

• Median

• Mode

• Range

Which measure of central tendency best represents this data?

• Mean

• Median

• Mode

• Range

Which class did better on the test?

• 1st period

• 2nd period

• They both performed the same

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

• Below average

• Above average

• Average