Homework Help: statistics

Posted by kasey on Wednesday, March 4, 2009 at 9:55pm.

The amount of snow fall falling in a certian mountain range is normally distributed with a mean of 83 inches, and a standard deviation of 16 inches. What is the probability that the mean annual snowfall during 64 randomly picked years will exceed 85.8 inches?

statistics - MathGuru, Wednesday, March 4, 2009 at 10:53pm
Use this formula to find z:

z = (x - mean)/(sd/√n)

With your data:

z = (85.8 - 83)/(16/√64) = ?

Once you have the z-score, look at the z-table to determine your probability.

I hope this will help get you started.

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