Chapter 7: Q. 27 (page 429)
For the sums of distribution to approach a normal distribution, what must be true?
The sample size is used to know the number of individuals who play an active role in statistical terms.
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An unknown distribution has a mean of , a standard deviation of , and a sample size of . Let one object of interest.
What is the standard deviation of ?
Find the probability that the sums will fall between the z-scores โ2 and 1.
Find the sum that is standard deviations below the mean of the sums.
46. Draw the graph from Exercise 7.45
Certain coins have an average weight of grams with a standard deviation of g. If a vending machine is designed to accept coins whose weights range from g to g, what is the expected number of rejected coins when randomly selected coins are inserted into the machine?
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