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March 29, 2015

March 29, 2015

Posted by **missy** on Saturday, November 15, 2008 at 5:49pm.

- math -
**drwls**, Saturday, November 15, 2008 at 7:45pm12.9 oz, which is two standard deviations below 13.5 oz

See http://psych.colorado.edu/~mcclella/java/normal/accurateNormal.html for a tool to do problems like this

- math -
**Reiny**, Saturday, November 15, 2008 at 8:27pm2.3% = .023

so that is the probability that it will be over 13.5 oz, or .977 is the prob that it will be below 13.5

normal distribution charts show the probability below a given z-score.

z-score = (real score - mean)/standard deviation

I used this chart

http://www.math.unb.ca/~knight/utility/NormTble.htm

I found .977 at a z-score of 2.00

so 2.00 = (13.5-m)/.3

m = 12.9

Using this data in

http://davidmlane.com/hyperstat/z_table.html

and clicking on "above" at 13.5 gave me .02275, close enough for .023

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