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The average amount of precipitation in Dallas, Texas, during the month of April is 3.5 inches (The World Almanac, 2000). Assume that a normal distribution applies and that the standard deviation is .8 inches.
a. What percentage of the time does the amount of rainfall in April exceed 5 inches?
b. A month is classified as extremely wet if the amount of rainfall is in the upper 10% for that month. How much precipitation must fall before a month of April is classified as extremely wet?
What sample size must you take to be 96% confident that the results will be within $.75 of the true mean cost per call?
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When we take the sample of 100 of these average is $500 and SD is $100. (a) Determine statement to make about range $300 to $700?
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