Chapter 6: Q. 2 (page 385)
A normal distribution has a mean of 61 and a standard deviation of 15. What is the median?
Short Answer
The median of the normal distribution will be
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Chapter 6: Q. 2 (page 385)
A normal distribution has a mean of 61 and a standard deviation of 15. What is the median?
The median of the normal distribution will be
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IQ is normally distributed with a mean of and a standard deviation of . Suppose one individual is randomly chosen. Let of an individual.
a.
b. Find the probability that the person has an IQ greater than . Include a sketch of the graph, and write a probability statement
c. MENSA is an organization whose members have the top of all IQs. Find the minimum IQ needed to qualify for the MENSA organization. Sketch the graph, and write the probability statement.
d. The middle of IQs fall between what two values? Sketch the graph and write the probability statement.
The length of time it takes to find a parking space at 9 A.M. follows a normal distribution with a mean of five minutes and a standard deviation of two minutes.
Find the probability that it takes at least eight minutes to find a parking space.
a. 0.0001
b. 0.9270
c. 0.1862
d. 0.0668
The life of Sunshine CD players is normally distributed with a mean of years and a standard deviation of years. A CD player is guaranteed for three years
Find the percentile of the distribution for the time a CD player lasts
a. Sketch the situation. Label and scale the axes. Shade the region corresponding to the lower .

b. Therefore,
Suppose a normal distribution has a mean of six and a standard deviation of 1.5. What is the z-score of x = 5.5?
How would you represent the area to the left of three in a probability statement?

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