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Chapter 7: Q.10 (page 428)
Find the sum that is standard deviations below the mean of the sums.
The sum is.
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82. Would you be surprised, based upon numerical calculations, if the sample average wait time (in minutes) for 100 riders was less than 30 minutes?
a. yes
b. no
c. There is not enough information.
A manufacturer produces 25-pound lifting weights. The lowest actual weight is 24 pounds, and the highest is 26 pounds. Each weight is equally likely so the distribution of weights is uniform. A sample of 100 weights is taken.
Find the 90th percentile for the total weight of the 100 weights.
Complete the distributions.
a. _____(_____,_____)
b. role="math" localid="1648618952256" _____(_____,_____)
According to the Internal Revenue Service, the average length of time for an individual to complete (keep records for, learn, prepare, copy, assemble, and send) IRS Form is hours (without any attached schedules). The distribution is unknown. Let us assume that the standard deviation is two hours. Suppose we randomly sample taxpayers.
a. In words,
b. In words,
c.
d. Would you be surprised if the taxpayers finished their Form s in an average of more than hours? Explain why or why not in complete sentences.
e. Would you be surprised if one taxpayer finished his or her Form in more than hours? In a complete sentence, explain why.
An unknown distribution has a mean of 45 and a standard deviation of eight. A sample size of 50 is drawn randomly from the population. Find the probability that the sum of the 50 values is more than
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