Assessment for Topics 1 to 12

Which of the following is a statistical question?

• How tall is Mr. Leung?

• What are the ages of all your cousins?

• What is the formula for the volume of a cube?

• What is the school’s address?

What is the value of the expression 1.578 ÷ 2.4?

• 65

• 6575

• 65.75

• 0.6575

Samuel keeps track of the number of hours he swims each week. Samuel makes the following box plot to represent his data. What is the most appropriate measure of center for the data? There (is/is not) an outlier.

• The most appropriate measure of center is the median because the data is skewed. There is not an outlier.

• The most appropriate measure of center is the mean because the data is symmetric. There is an outlier.

• The most appropriate measure of center is the mode because the data is uniform. There is not an outlier.

• The most appropriate measure of center is the mean because the data is skewed. There is not an outlier.

The number of students in each of the classes that Julia is taking and each of the classes that Mason is taking are shown below. Julia’s classes: {25, 23, 28, 32, 27} Mason’s classes: {20, 26, 24, 31, 29} Select all the statements that are true.

• The mean is greater for Mason’s classes than for Julia’s classes.

• For both sets of data, the median is equal to the mean.

• The range for Julia’s classes is 7.

• The range for Mason’s classes is 11.

• Neither data set has a mode.

In one week, the height of a plant increased from 28 centimeters to 31 centimeters. What is the percent increase in plant height? Round to the nearest percent.

• 11%

• 7%

• 9%

• 13%

Claire buys a jacket that originally cost $76. The price is marked down 25% for a sale, and Claire has a coupon to further reduce the marked down price by 10%. How much does Claire pay for the jacket?

• $49.40

• $51.30

• $57.00

• $68.40

What can you conclude from the means?

On average, students in the sixth-period class scored (a)   than students in the second-period class.

• higher

• lower

• the same

• unknown

In a game of chance, players spin the pointer of a spinner with eight equal-sized sections. What is the probability that the pointer will land in an odd-numbered section?

• 1/2

• 5/8

• 3/4

• 7/8

The probability that a 7th grader will send a text during the day is 80%. How can you describe this probability? It is ________ that a 7th grader will send a text message during the day.

• impossible

• unlikely

• likely

• certain

A spinner has eight equal sections labeled 1–8. The pointer lands on an even number 120 times out of 250 spins. Select all the true statements.

• The pointer lands on an even number more often than expected.

• The pointer lands on an even number less often than expected.

• It is equally likely that the pointer will land on an even or odd number.

• The theoretical probability of landing on an even number is 60%.

• The experimental probability of landing on an even number is 48%.