SOLUTION: A large population has a standard deviation of 60. If a sample of size 36 is selected from this population, what is the probability that the sample mean will be within ±12 of the

Question 1137707: A large population has a standard deviation of 60. If a sample of size 36 is selected from this population, what is the probability that the sample mean will be within ±12 of the population mean?
So far I know That standard Deviation = 60, N= 36, and simplified to P(x+-12 of M)
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
z=(x bar-mean)/sd/sqrt(n)
>-12/60/6=-1.2
x<(12/60/6)=+1.2
probability z is between -1.2 and +1.2
=0.7699
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