Chapter 9 Review

Determine whether the question is a statistical question.

"How many students in your class have a first name that is four letters long?"

• Statistical

• Non Statistical

Answer explanation

There is only one answer to this question, so it is none statistical.

Determine whether the question is a statistical question.

"How much do new cell phones cost?"

• Statistical

• Non Statistical

Answer explanation

There could be many different answers for this question depending on the brand and where you're buying the phone from, so this is a statistical question.

Determine whether the question is a statistical question.

"In what month were the students in the sixth grade class born?"

• Statistical

• Non Statistical

Answer explanation

There could be many different answers for this question depending on the brand and where you're buying the phone from, so this is a statistical question.

Display the data in a dot plot.

2, 2, 5, 5, 1, 3, 8, 3, 5, 3, 7, 6, 3, 6, 7, 6, 1, 8

A group of five 6th graders measure and record their weights. The weights (in pounds) are 99, 70, 82, 98, and 76. Find the mean of the weights.

Mathematical Equivalence

ON

Answer explanation

add all the numbers up and divide by the number of numbers.

A group of five 6th graders measure and record their weights. The weights (in pounds) are 99, 70, 82, 98, and 76. Find the median of the weights.

Mathematical Equivalence

ON

Answer explanation

Put them in order from least to greatest then find the number in the middle.

A group of five 6th graders measure and record their weights. The weights (in pounds) are 59, 57, 62, 58, and 59. Find the median of the weights.

Mathematical Equivalence

ON

Answer explanation

Put them in order from least to greatest then find the number in the middle.

A group of five 6th graders measure and record their weights. The weights (in pounds) are 59, 57, 62, 58, and 59. Find the mean of the weights.

Mathematical Equivalence

ON

Answer explanation

Add all the numbers and divide by the number of numbers.

Find the mode of the data:

54, 57, 56, 58, 55, 57, 60, 59, 57, 56

Mathematical Equivalence

ON

Answer explanation

Mode is the most occurring number or the number you see the most in a list.

Find the mode of the data:

22, 25, 25, 20, 17, 21, 24, 25, 21, 18

Mathematical Equivalence

OFF

Answer explanation

Mode is the most occurring number or the number you see the most in a list.