Suppose the heights of professional horse jockeys are normally distributed with a mean of 62 in. and a standard deviation of 2 in.

Which group describes 16% of the population of horse jockeys?

Selecteachcorrect answer.

• jockeys who are shorter than 60 in.
• jockeys who are between 60 in. and 64 in.
• jockeys who are taller than 64 in.
• jockeys who are shorter than 58 in.

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The weights of bags of ready-to-eat salad are normally distributed with a mean of 300 grams and a standard deviation of 9 grams.

What percent of the bags weigh less than 282 grams?

• 2.5%
• 5%
• 13.5%
• 34%

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The number of nails in a 5 lb box is normally distributed with a mean of 325 nails and a standard deviation of 15 nails.

Suppose that 1200 different 5 lb boxes are in a warehouse.

About how many boxes contain more than 340 nails?

• 170
• 192
• 340
• 384

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Times for an ambulance to respond to a medical emergency in a certain town are normally distributed with a mean of 450 seconds and a standard deviation of 50 seconds.

Suppose there are 160 emergencies in that town.

In about how many emergencies are the response times expected between 400 seconds and 500 seconds?

• 51
• 55
• 80
• 109

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Select Yes or No to state whether each data set is likely to be normally distributed.

Data SetYesNothe number of eggs collected each week on a large farmthe number of yolks in randomly selected eggsthe weights of eggs in the kitchen of a restaurantthe number of eggs in cartons sold at a supermarket__

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Suppose a normal distribution has a mean of 12 and a standard deviation of 4.

A value of 18 is how many standard deviations away from the mean?

• 2
• 1.5
• 1.5
• 2

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Suppose the ages of cars driven by employees at a company are normally distributed with a mean of 8 years and a standard deviation of 3.2 years.

What is thez-score of a car that is 6 years old?

• 1.6
• 0.625
• 0.625
• 1.6

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Suppose the velocities of golf swings for amateur golfers are normally distributed with a mean of 95 mph and a standard deviation of 3.9 mph.

What is the difference in velocities between a golfer whosez-score is 0 and another golfer whosez-score is1

?

• 1.95 mph
• 2.9 mph
• 3.9 mph
• 7.8 mph

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Suppose Company A produces packages of throat lozenges that are normally distributed with a mean of 38.2 individual lozenges and a standard deviation of 1.7 lozenges.

Company B produces packages of throat lozenges that are normally distributed with a mean of 36.9 individual lozenges and a standard deviation of 2.4 lozenges.

Select from the drop-down menus to correctly complete the statement.

Since thez-score fromChoose...

Company A

Company B

is closer to zero than thez-score ofChoose...

Company A

Company B

, the company that produced a package with 43 lozenges in it is most likelyChoose...

Company A

Company B

• .