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The average playing time of compact discs in a large collection is 35 min, and the standard deviation is 5 min.
a. What value is 1 standard deviation above the mean? 1 standard deviation below the mean? What values are 2 standard deviations away from the mean?
b. Without assuming anything about the distribution of times, at least what percentage of the times are between 25 and 45 min?
c. Without assuming anything about the distribution of times, what can be said about the percentage of times that are either less than 20 min or greater than 50 min?
d. Assuming that the distribution of times is normal, approximately what percentage of times are between 25 and 15 mph. A histogram revealed that the vehicle speed at impact distribution was approximately normal.
a. Roughly what proportion of vehicle speeds were between 27 and 57 mph?
b. Roughly what proportion of vehicle speeds exceeded 57 mph?
A. what is the probability a randomly chosen business customer flying is on a jumbo jet? B. what is the probability a randomly chosen non-business customer is on an ordinary jet?
Suppose that the population of 25-year-old American males has an average remaining life expectancy of 50 years with a standard deviation of 5 years and that life expectancy is normally distributed. What proportion of these 25-year-old males wil..
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What is the expected total activity time in weeks for each of the five separate paths through the network? What is the critical path for the network and associated overall project completion time in weeks?
What is the relationship between confidence intervals and hypothesis testing? How are they the same? How are they different? Which one is better?
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