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January 30, 2015

January 30, 2015

Posted by **Paul** on Tuesday, March 5, 2013 at 1:52pm.

- Statistics -
**MathGuru**, Tuesday, March 5, 2013 at 4:09pmUse this formula for z-scores:

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 z-table 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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