Mean Median Standard Deviation

Jeff has four grades from tests and IXL. They are all weighted equally. If Jeff's grades are 100, 96, 96, and 100, what Jeff's current average grade?

• 96

• 97

• 98

• 100

Jessica has five grades from assessments and quizzes. They are all weighted equally. If her grades are 50, 70, 88, 70, and 88, what is her current average grade?

• 71

• 72

• 73

• 74

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

Which measure of central tendency best represents this data?

• Mean

• Median

• Mode

• Range

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%

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

• Below average

• Above average

• Average

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

• Below average

• Above average

• Average