Friday

January 30, 2015

January 30, 2015

Posted by **Lindsey** on Sunday, December 2, 2007 at 8:32pm.

- Math Quantitive Reasoning -
**Reiny**, Sunday, December 2, 2007 at 8:56pmthe z score for $14 is (14-50)/12 = -3

the z score for $86 = (86-50)/12 = +3

at this point you will need a table of values of z scores, or some distribution calculator

Here is a rather simple one

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

You could either enter

mean: 0

standard deviation: 1

between -3 and +3

or for this one we didn't even have to calculate the z-scores and could have entered

Mean 50

SD 12

between 14 and 86, notice we got the same result, .9973 which is 99.73%

**Answer this Question**

**Related Questions**

Math - Use the 68-95-99.7 rule to solve the problem. - The amount of Jen's ...

mathematical modeling - Use the 68-95-99.7 rule to solve: The amount of Jen's ...

Statistics - The amount of a monthly phone bill is normally distributed with a ...

ashworth college - The amount of Jen’s monthly phone bill is normally ...

Math - According to CTIA-The Wireless Association, the mean monthly cell phone ...

statistics - The customer bills in a family restaurant are normally distributed...

statistics - The average electric bill in a residential area is $72 for the ...

Statistics - Electricity bills in a certain city have mean $120.08. Assume the ...

statistics - A survey found that women's heights are normally distributed with ...

math 115 - i am trying to find this answer there are 3 questions. 1. micheal ...