The manufacturer of a new compact car claims the miles per gallon (mpg) for the gasoline consumption is mound-shaped and symmetric with a mean of 24.6 mpg and a standard deviation of 9.5 mpg. If 30 such cars are tested, what is the probability the average mpg achieved by these 30 cars will be greater than 28?
Added by Angela C.
Step 1
The formula for SE is standard deviation divided by the square root of the sample size. In this case, the standard deviation is 9.5 and the sample size is 30. So, SE = 9.5 / sqrt(30) = 1.73. Show more…
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