Posted by Paul on Tuesday, March 5, 2013 at 1:52pm.
An April 15, 2002 report in Time Magazine stated that the average age for women to marry in the United States is now 24.5 years of age. If the standard deviation is assumed to be 4.1 years, find the probability that a random sample of 32 U.S. women would show a mean age at marriage of less than or equal to 22.7 years.

Statistics  MathGuru, Tuesday, March 5, 2013 at 4:09pm
Use this formula for zscores:
z = (x  mean)/(sd/√n)
With the data from your problem:
z = (22.7  24.5)/(4.1/√32) = ?
Finish the calculation.
Next, look at a ztable to find your probability. Remember that the problem is asking for "less than or equal to" when looking at the table.
I hope this helps.
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