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Posted by **Sue** on Wednesday, April 20, 2011 at 4:20pm.

- Statistics -
**MathGuru**, Wednesday, April 20, 2011 at 7:25pmUse z-scores and a z-table to find your percentages.

Let's look at the very last question and then see if you can figure out the other two questions.

Find two z-scores using this formula:

z = (x - mean)/sd

mean = 60

sd = 8

x = 50, 72

Therefore:

z = (50 - 60)/8 = ?

z = (72 - 60)/8 = ?

I'll let you finish the calculations.

Once you have the z-scores, check a z-table for the probability between those two scores. Once you have that value, convert to a percent.

I hope this will help get you started.

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