Posted by **Celest** on Wednesday, July 20, 2011 at 9:07pm.

A set of 50 data values has a mean of 30 and a variance of 4.

I. Find the standard score (z) for a data value = 26.

II. Find the probability of a data value < 26.

I think the first part is z=(26-30)/4 = -4/4 = -1. I am not sure how to go about the second problem. I could use any help. Thanks

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