AFDA Unit 7 Quiz 3-Normal Distribution V1

The speeds of cars on the highway have a mean of 95 km/h with a standard deviation of 5 km/h.

What percentage of cars averaged less than 85 km/h?

• 13.5%

• 2.5%

• 16%

• 0.15%

The speeds of cars on the highway have a mean of 95 km/h with a standard deviation of 5 km/h.

If a police car stopped cars that were going more than 105 km/h, how many cars would they stop if there were 8000 cars on the highway?

• 50 cars

• 100 cars

• 500 cars

• 270 cars

The monthly income of 5 000 workers at the Microsoft plant are distributed normally. Suppose the mean monthly income is $1250 and the standard deviation is $250.

Which is the normal distribution curve for the data?

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The monthly income of 5 000 workers at the Microsoft plant are distributed normally. Suppose the mean monthly income is $1250 and the standard deviation is $250.

How many workers earn more than $1500 per month?

• 675 workers

• 800 workers

• 1700 workers

• 2500 workers

The monthly income of 5 000 workers at the Microsoft plant are distributed normally. Suppose the mean monthly income is $1250 and the standard deviation is $250.

How many workers earn less than $750 per month?

• 675 workers

• 800 workers

• 125 workers

• 250 workers

The monthly income of 5 000 workers at the Microsoft plant are distributed normally. Suppose the mean monthly income is $1250 and the standard deviation is $250.

What percentage of the workers earn between $750 and $1500 per month?

• 68%

• 81.5%

• 97.5%

• 50%

The monthly income of 5 000 workers at the Microsoft plant are distributed normally. Suppose the mean monthly income is $1250 and the standard deviation is $250.

What percentage of the workers earn less than $1750 per month?

• 68%

• 81.5%

• 97.5%

• 50%

The length of life of an instrument produced by a machine has a normal distribution with a mean of 12 months and standard deviation of 2 months. Find the probability that an instrument produced by this machine will last

Which is the normal distribution curve for the data?

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• 
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The length of life of an instrument produced by a machine has a normal distribution with a mean of 12 months and standard deviation of 2 months. Find the probability that an instrument produced by this machine will last between 8 and 12 months.

• 47.5%

• 13.5%

• 16%

• 50%

The length of life of an instrument produced by a machine has a normal distribution with a mean of 12 months and standard deviation of 2 months. Find the probability that an instrument produced by this machine will last more than 14 months.

• 16%

• 50%

• 34%

• 95%