Chapter 5 Test Review Statistics

Chapter 5 Test Review Statistics

12th Grade

14 Qs

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Chapter 5 Test Review Statistics

Chapter 5 Test Review Statistics

Assessment

Quiz

Mathematics

12th Grade

Practice Problem

Hard

Created by

Anthony Clark

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14 questions

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1.

MULTIPLE CHOICE QUESTION

1 min • 5 pts

Kitchen appliances don’t last forever. The lifespan of all microwave ovens sold in the United States is approximately Normally distributed with a mean of 9 years and a standard deviation of 2.5 years. What percentage of the ovens last more than 10 years?

11.5%

34.5%

65.5%

69%

84.5%

2.

MULTIPLE CHOICE QUESTION

1 min • 5 pts

The following statistics were produced at the end of a week at a weight loss center indicating pounds lost.

 

Mean = 5 lbs                           Median = 7 lbs                                    Mode = 4 lbs

First Quartile = 2 lbs               Third Quartile = 8.5 lbs                      Standard Deviation = 0.5 lbs

 

Which of the following statement(s) are correct?

 

I. One quarter of weight watchers lost 2 pounds or less.

II. The middle 50% of the weight waters lost between 2 and 8.5 pounds.

III. The most common weight loss waas 4 pounds.

I only

II only

III only

I and III

I, II, and III

3.

MULTIPLE CHOICE QUESTION

1 min • 5 pts

The distribution of weights of female college cross-country runners is approximately normal with mean 122 pounds and standard deviation 8 pounds. Which of the following is closest to the percent of the runners who weigh between 114 pounds and 138 pounds?

18%

32%

68%

82%

95%

4.

MULTIPLE CHOICE QUESTION

1 min • 5 pts

A student obtained a z-score of -1.40 on a national test for which the mean score was 500 and the standard deviation was 50. The student’s actual test score was

570

430

564

640

450

5.

MULTIPLE CHOICE QUESTION

1 min • 5 pts

The mean age (at inauguration) of all U.S. Presidents is approximately Normally distributed with a mean of 54.6.  Barack Obama was 47 when he was inaugurated, which is the 11th percentile of the distribution.  Which of the following is closest to the standard deviation of presidents’ ages?

-9.20

-6.18

6.18

7.60

9.20

6.

MULTIPLE CHOICE QUESTION

1 min • 5 pts

A different species of cockroach has weights that follow a Normal distribution with a mean of 50 grams. After measuring the weights of many of these cockroaches, a lab assistant reports that 14% of the cockroaches weight more than 55 grams. Based on this report, what is the approximate standard deviation of weights for this species of cockroaches?

4.6

5.0

6.2

14.0

cannot be determined

7.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Media Image

This data is normally distributed.  What percent of the data is in the shaded region?

68%

95%

99.7%

50%

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