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Chapter 6: Q.37 (page 386)
About what percent of values lie between the mean and three standard deviations?
The values which lie between the mean and three standard deviations will be:
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The patient recovery time from a particular surgical procedure is normally distributed with a mean of days and a standard deviation of days.
What is the median recovery time?
a. 2.7
b. 5.3
c. 7.4
d. 2.1
Suppose X ~ N(8, 1). What value of x has a z-score of 鈥�2.25?
Facebook provides a variety of statistics on its Web site that detail the growth and popularity of the site.
On average, 28 percent of 18 to 34 year olds check their Facebook profiles before getting out of bed in the morning. Suppose this percentage follows a normal distribution with a standard deviation of five percent.
a. Find the probability that the percent of 18 to 34-year-olds who check Facebook before getting out of bed in the morning is at least 30 .
b. Find the percentile, and express it in a sentence.
Suppose . Between what values does of the data lie?
a. Suppose a to -year-old male from Chile was tall from to . The z-score when cm is _______. This score tells you that is ________ standard deviations to the ________ (right or left) of the mean _____ (What is the mean?). b. Suppose that the height of a to -year-old male from Chile from to has a -score of . What is the male鈥檚 height? The -score tells you that the male鈥檚 height is ________ standard deviations to the __________ (right or left) of the mean.
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