Saturday

September 20, 2014

September 20, 2014

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

**Answer this Question**

**Related Questions**

math - Instant dinner comes in packages with weights that are normally ...

college math - Math homework please help!! 2. Suppose that people’s weights are ...

Statistics - The actual weights of bag of pet food are normally distributed.The ...

math - the mean weigh of 500 male students at a certain college is 151 lb , and ...

math - Suppose that people’s weights are normally distributed, with mean 175 ...

math - 2. Suppose that people’s weights are normally distributed, with mean 175 ...

Statistics - The actual weights of bag of pet food are normally distributed.The ...

Math - The weights of adult long-tongued fruit bats are known to be normally ...

math - The weights of adult long-tongued fruit bats are known to be normally ...

Statistics - A particular fruit's weights are normally distributed, with a mean ...