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January 25, 2015

January 25, 2015

Posted by **Amanda** on Monday, October 27, 2008 at 10:11pm.

a)Find the chance that the average of the draws will be in the range 65 to 85.

b)repeat for the range 74 to 76.

- statistics -
**MathGuru**, Tuesday, October 28, 2008 at 9:21pmUse z-scores and a z-table for this problem. Because you are given a sample size, you will need to include the sample size in the calculation:

z = (x - mean)/(sd/√n)

For a):

This will be very close to 100% chance that the average of the draws will be in the range listed (z-scores will be very large).

For b):

z = (74 - 75)/(10/√100)

z = (76 - 75)/(10/√100)

Finish the calculation for both z-scores. Use the z-table to find the probability between the two scores.

I hope this will help get you started.

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