Multiple Choice
A study of nickels showed that the the standard deviation of the weight of nickels is 150 milligrams. A coin counter manufacturer wishes to find the 80% confidence interval for the average weight of a nickel. How many nickels does he need to weigh to obtain an average accurate to within 10 milligrams?
A) 225
B) 369
C) 613
D) 159
Correct Answer:
Verified
Correct Answer:
Verified
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