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Chapter 7: Q.28 (page 429)
What three things must you know about distribution to find the probability of sums?
We must know: mean, standard deviation and sample size of the distribution.
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For the sums of distribution to approach a normal distribution, what must be true?
The cost of unleaded gasoline in the Bay Area once followed an unknown distribution with a mean of and a standard deviation of . Sixteen gas stations from the Bay Area are randomly chosen. We are interested in the average cost of gasoline for the gas stations. The distribution to use for the average cost of gasoline for the gas stations is:
a.
b.
c.
d.
What is the mean, standard deviation, and sample size?
The length of time a particular smartphone's battery lasts follows an exponential distribution with a mean of ten months. A sample of 64 of these smartphones is taken.
Find the middle 80% for the total amount of time 64 batteries last.
An unknown distribution has a mean of 19 and a standard deviation of 20. Let X = the object of interest. What is the sample size if the mean of ΣX is 15,200?
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