Posted by Joel on Wednesday, March 23, 2011 at 9:48pm.
Using the z-test formula, solve for sample mean:
z = (sample mean - population mean)/(standard deviation divided by the square root of the sample size)
Find z in a z-table using p-value. Population mean is 48. Standard deviation is 3.5 and sample size is 75.
I'll let you take it from here.
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