Unit 10 Test Review

The heights (in inches) of 20 individuals are listed below. Find the measures of central tendency and dispersion.

{70, 72, 71, 70, 69, 73, 59, 68, 70, 71, 67, 71, 70, 74, 69, 68, 71, 71, 71, 72}

Match the following:

• 1.7

• Median

• 70.4

• Mode

• 70.5

• Range

• 71

• Mean

• 7

• Standard Deviation

Select all characteristics that would describe the given graph.

• The distribution of the exam results are uniform.

• The spread of the results are about 50 points.

• The distribution of the exam results are symmetric.

• The distribution of the exam results are unimodal.

• The center of the distribution is about 50.

Use the standard normal table or desmos to find the value.

Left of z = -0.59

• 0.9826

• 0.2776

• 0.7389

• 0.0096

• 0.5438

Use the standard normal table or desmos to find the value.

Right of z = 2.34

• 0.9826

• 0.2776

• 0.7389

• 0.0096

• 0.5438

Use the standard normal table or desmos to find the value.

Between z = -3.29 and z = 0.11

• 0.9826

• 0.2776

• 0.7389

• 0.0096

• 0.5438

Use the standard normal table or desmos to find the value.

P(z > -0.64)=

• 0.9826

• 0.2776

• 0.7389

• 0.0096

• 0.5438

Find the z-score for a value of 97, when the mean is 60 and the standard deviation is 7.

 

• z = 5.29

• z = 5.14

• z = 1.50

• z = -1.50

An airline knows from experience that the distribution of the number of suitcases that get lost each week on a certain route is approximately normal with a mean of 15.5 and a standard deviation of 3.6. What is the probability that during a given week the airline will lose less than 20 suitcases?

• 0.3944

• 0.1056

• 0.4040

• 0.8944

Assume that the salaries of elementary school teachers in the United States are normally distributed with a mean of $32,000 and a standard deviation of $3000. If a teacher is selected at random, find the probability that he or she makes more than $36,000.

• 0.0918

• 0.9082

• 0.1056

• 0.4040

For the standard normal curve, find the z-score that corresponds to the 30th percentile.

• -0.47

• -0.53

• -0.12

• -0.98