(Solved) (16pts): Oil consumption in ounces was tested on a large sample of industrial engines. The average consumption is 120 ounces, and the standard
Question: (16pts):
Oil consumption in ounces was tested on a large sample of industrial engines. The average consumption is 120 ounces, and the standard deviation of the measurements is 20 ounces. The distribution looks reasonably like a normal curve. Use the normal approximation to estimate the following percentages.
- (4pts) Calculate the percentage of engines consuming between 100 and 140 ounces.
- (4pts) Calculate the percentage of engines consuming over 140 ounces.
- (4pts) Calculate the percentage of engines consuming between 100 and 110 ounces.
- (4pts) What is the value (ounces) of the 15 th percentile consumption?
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