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  3. a) suppose that the mean and standard deviation of

A) Suppose that the mean and standard deviation of the scores on a statistics exam are...

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Basic Math

A) Suppose that the mean and standard deviation of the scores ona statistics exam are 89.2 and 6.49, respectively, and areapproximately normally distributed. Calculate the proportion ofscores below 77.

1)

0.0301

2)

0.9699

3)

We do not have enough information to calculate the value.

4)

0.2146

5)

0.7854

B)

When students use the bus from their dorms, they have an averagecommute time of 8.974 minutes with standard deviation 3.1959minutes. Approximately 66.9% of students reported a commute timeless than how many minutes? Assume the distribution isapproximately normal.

1)

4.51

2)

10.37

3)

13.44

4)

We do not have enough information to calculate the value.

5)

7.58

C)

The revenue of 200 companies is plotted and found to follow abell curve. The mean is $637.485 million with a standard deviationof $27.6736 million. Would it be unusual for a randomly selectedcompany to have a revenue above $687.08 million?

1)

The value is unusual.

2)

We do not have enough information to determine if the value isunusual.

3)

The value is not unusual.

4)

It is impossible for this value to occur with this distributionof data.

5)

The value is borderline unusual.

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