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Chapter 6: Q.9 (page 385)
What does standardizing a normal distribution do to the mean?
When you standardize a normal distribution, the mean becomes 0 and the standard deviation becomes 1
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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,
About what percent of values lie between the mean and one standard deviation?
The scores on a college entrance exam have an approximate normal distribution with mean, points and a standard deviation, points.
a. About of the values lie between what two values? These values are ________________. The -scores are ________________, respectively.
b. About of the values lie between what two values? These values are ________________. The -scores are ________________, respectively.
c. About of the values lie between what two values? These values are ________________. Thescores are ________________, respectively.
In a normal distribution, x = 6 and z = –1.7. This tells you that x = 6 is ____ standard deviations to the ____ (right or left) of the mean.
A bottle of water contains fluid ounces with a standard deviation of ounces. Define the random variable in words. ____________.
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