Measures of Center and Variance

What is the variance for the data given:

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

• 47.49

• 102.01

• 52.77

• 81

What is the standard deviation for the data population given:

{12, 13, 29, 18, 61, 35, 21}

• 293.67

• 15.87

• 17.14

• 41.98

A data set can have more than one median?

• True

• False

The number of miles that Jenna cycled each week for a 7-week period is shown: 
36, 42, 28, 52, 48, 36, 31 
What is the median number of miles Jenna cycled?

• 24

• 36

• 39

• 52

The number of pages that Carolyn wrote in her journal each day from Monday to Friday is shown below: 
9, 8, 12, 6, 10
What is the mean number of pages she wrote per day?

• 5

• 6

• 9

• 11

The mode score on the 6th grade math test was 94! Which of these interpretations must be correct?

• 94 was the highest score on the test.

• More students received a 94 than any other score

• No student scored below a 94

• A score of 91 was slightly below average.

When finding the median, if you have two numbers in the middle, you should

• add them together and divide by two

• find the number in between the two

• find the mean of the two numbers

• all of these

• 136
• 150
• 156
• 153

The number of text messages that Isaac received each day for a week is shown: 47, 49, 54, 50, 48, 47, 55
What is the mean and median

• Mean=49
  Median=54

• Mean=49 
  Median=50

• Mean=50 
  Median=54

• Mean=50
  Median=49

Standard Deviation is a measure of spread, which represents the average of the distance between individual data values and the mean.

• True

• False