Asked by thickhoneybrown

The average price of a gallon of unleaded regular gasoline was reported to be $2.34 in Northern Kentucky use this price as a population mean population standard deviation is $.20. question. what is the probability that the mean price for a sample of 30 station is good then $.03 of the population mean?
Answered by Damon
http://davidmlane.com/hyperstat/z_table.html
Answered by thickhoneybrown
Even though u shown me Damon but how would the formula be set up I just want to know for future reference
Answered by Damon
mean = 2.34

sd = .2

z = + or - .03/.2

look for probability of being within z = +/- .15 of mean
Answered by thickhoneybrown
Soo Damon do I plug in the mean within the problem cause I'm still lost
Answered by thickhoneybrown
Or Damon do I divide .03/2 to come up with -/+ answers?
Answered by thickhoneybrown
Now Damon I figure out that soo now do I take the mean and the probability and divide that again?
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