Refer to the Electrical Engineering (Vol. 95, 2013) study of the power quality (sags and swells) of
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Refer to the Electrical Engineering (Vol. 95, 2013) study of the power quality (sags and swells) of a transformer, Exercise 2.76 (p. 86). For transformers built for heavy industry, the distribution of the number of sags per week has a mean of 353 with a standard deviation of 30. Of interest is x̅, the sample mean number of sags per week for a random sample of 45 transformers.
a. Find E(x̅) and interpret its value.
b. Find Var(x̅).
c. Describe the shape of the sampling distribution of x̅.
d. How likely is it to observe a sample mean number of sags per week that exceeds 400?
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Related Book For 
Statistics For Business And Economics
ISBN: 9780134506593
13th Edition
Authors: James T. McClave, P. George Benson, Terry Sincich
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