A) -1.48 B) 1.45 C) 1.48 D) 1.26 E) 1.39 A) -1.48 B) 1.45 C) 1.48 D) 1.26 E) 1.39

A) -1.46 to 1.46 B) -1.45 to 1.45 C) -1.39 to 1.39 D) -1.53 to 1.53 E) -1.00 to 1.00 A) -1.46 to 1.46 B) -1.45 to 1.45 C) -1.39 to 1.39 D) -1.53 to 1.53 E) -1.00 to 1.00

A) 99.87% B) 43.67% C) 49.87% D) 12.17% E) 50.13% A) 99.87% B) 43.67% C) 49.87% D) 12.17% E) 50.13%

A) -1.34 B) 1.39 C) 1.26 D) 1.34 E) 1.45 A) -1.34 B) 1.39 C) 1.26 D) 1.34 E) 1.45

Exam 5: The Standard Deviation As a Ruler and the Normal Model

Here are some summary statistics for all of the runners in a local 12 kilometre race: slowest time = 132 minutes,mean = 76 minutes,median = 76 minutes,range = 102 minutes,IQR = 62,Q1 = 30,standard deviation = 10 minutes.Between what two values are the middle 50% of times?

(Multiple Choice)

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Question 101

the highest 7%

(Multiple Choice)

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Question 102

The freethrow percentages for the participants in a basketball tournament were compiled.The percents ranged from 33% to 99% with a mean of 56% and a standard deviation of 7%.The quartiles and median percentages were 43%,87%,and 56%.Is the distribution symmetric,skewed to the left,or skewed to the right? Explain.

(Multiple Choice)

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Question 103

A basketball coach kept statistics for his team in free throw percentage and steals (among others).At the last game,Erin's free throw percentage was 79% and she had 4 steals.The team averaged 90% from the free throw line with a standard deviation of 6% and they averaged 7 steals with a standard deviation of 4.In which category did Erin do better compared with her team? Explain.

(Multiple Choice)

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Question 104

The setter on your school's volleyball team average 58 assists per match with a standard deviation of 6.How many standard deviations from the mean is an outing with 79 assists?

(Multiple Choice)

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Question 105

the middle 87.4%

(Multiple Choice)

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Question 106

σ = 150,9.18% below 900;μ = ?

(Multiple Choice)

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Question 107

The average speed cars travel on a road is 77 km/h.A car travelling 60 km/h has a z-score of -1.7.Find the standard deviation.

(Multiple Choice)

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Question 108

For a recent English exam,use the Normal model N(73,9.2)to find the percent of scores under 58.Round to the nearest tenth of a percent.

(Multiple Choice)

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Question 109

Here are the weekly winnings for several local poker players: $100,$50,$125,$75,$80,$60,$110,$150,$300,$700,$115,$75,$1000,$5000.Which is a better summary of the spread,the standard deviation or the IQR? Explain.

(Multiple Choice)

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Question 110

0 < z < 3.01

(Multiple Choice)

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Question 111

You heard that the average number of years of experience among stockbrokers is 14 years.You can't remember the standard deviation somebody with 8 years experience has a z-score of -2.Find the standard deviation.

(Multiple Choice)

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Question 112

Here are some statistics for the annual Wildcat golf tournament: lowest score = 56,mean score = 90,median = 98,range = 94,IQR = 106,Q1 = 36,standard deviation = 11.Is the distribution symmetric,skewed to the left,or skewed to the right? Explain.

(Multiple Choice)

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Question 113

Here are some summary statistics for annual snowfall in a certain town compiled over the last 15 years: lowest amount = 18 cm,mean = 49 cm,median = 42 cm,range = 82 cm,IQR = 50,Q1 = 20,standard deviation = 10 cm.Between what two values are the middle 50% of snowfall found?

(Multiple Choice)

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Question 114

For a recent English exam,use the Normal model N(73,9.2)to find the percent of scores over 85.Round to the nearest tenth of a percent.

(Multiple Choice)

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Question 115

σ = 10,68% below 200;μ = ?

(Multiple Choice)

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Question 116

the highest 9%

(Multiple Choice)

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Question 117

An English instructor gave a final exam and found a mean score of 70 points and a standard deviation of 6.8 points.Assume that a Normal model can be applied.Draw and label the Normal model for the exam scores.Describe the scores of the top 2.5%.

(Multiple Choice)

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Question 118

Based on the Normal model for car speeds (in km/h)on a road N(77,9.1),what is the cutoff value for the highest 15% of the speeds?

(Multiple Choice)

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Question 119

A town's average snowfall is 40 cm per year with a standard deviation of 12 cm.How many standard deviations from the mean is a snowfall of 64 cm?

(Multiple Choice)

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Question 120

Showing 101 - 120 of 131

Exam 5: The Standard Deviation As a Ruler and the Normal Model

Here are some summary statistics for all of the runners in a local 12 kilometre race: slowest time = 132 minutes,mean = 76 minutes,median = 76 minutes,range = 102 minutes,IQR = 62,Q1 = 30,standard deviation = 10 minutes.Between what two values are the middle 50% of times?

the highest 7%

The setter on your school's volleyball team average 58 assists per match with a standard deviation of 6.How many standard deviations from the mean is an outing with 79 assists?

the middle 87.4%

σ = 150,9.18% below 900;μ = ?

The average speed cars travel on a road is 77 km/h.A car travelling 60 km/h has a z-score of -1.7.Find the standard deviation.

For a recent English exam,use the Normal model N(73,9.2)to find the percent of scores under 58.Round to the nearest tenth of a percent.

Here are the weekly winnings for several local poker players: $100,$50,$125,$75,$80,$60,$110,$150,$300,$700,$115,$75,$1000,$5000.Which is a better summary of the spread,the standard deviation or the IQR? Explain.

0 < z < 3.01

You heard that the average number of years of experience among stockbrokers is 14 years.You can't remember the standard deviation somebody with 8 years experience has a z-score of -2.Find the standard deviation.

Here are some statistics for the annual Wildcat golf tournament: lowest score = 56,mean score = 90,median = 98,range = 94,IQR = 106,Q1 = 36,standard deviation = 11.Is the distribution symmetric,skewed to the left,or skewed to the right? Explain.

Here are some summary statistics for annual snowfall in a certain town compiled over the last 15 years: lowest amount = 18 cm,mean = 49 cm,median = 42 cm,range = 82 cm,IQR = 50,Q1 = 20,standard deviation = 10 cm.Between what two values are the middle 50% of snowfall found?

For a recent English exam,use the Normal model N(73,9.2)to find the percent of scores over 85.Round to the nearest tenth of a percent.

σ = 10,68% below 200;μ = ?

the highest 9%

An English instructor gave a final exam and found a mean score of 70 points and a standard deviation of 6.8 points.Assume that a Normal model can be applied.Draw and label the Normal model for the exam scores.Describe the scores of the top 2.5%.

Based on the Normal model for car speeds (in km/h)on a road N(77,9.1),what is the cutoff value for the highest 15% of the speeds?

A town's average snowfall is 40 cm per year with a standard deviation of 12 cm.How many standard deviations from the mean is a snowfall of 64 cm?

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