Tuesday

October 21, 2014

October 21, 2014

Posted by **Laura** on Sunday, April 1, 2012 at 2:04pm.

- statistics -
**MathGuru**, Monday, April 2, 2012 at 7:08pmUse z-scores.

z = (x - mean)/sd

x = 115

mean = 100

sd = 15

Use a z-table to find probability of less than 115 using the z-score calculated above. Convert to a percent.

I hope this will help.

**Answer this Question**

**Related Questions**

statistics - 2. The grades on a statistics midterm exam were normally ...

Statistics - 1. The mean and standard deviation of the grades of a group of ...

Algebra II - The grades on the last math exam had a mean of 88%. Assume the ...

Normal Probability Distribution - A professor at a local college noted that the ...

statistics - Percentage grades in a large physics class follow a normal ...

Quantitative methods - the mean and standard deviation of the grades of 500 ...

Quantitative methods - the mean and standard deviation of the grades of 500 ...

statistics - A professor informs her class that a test is very difficult, but ...

Statistics - The grades for Economics students at a large university are found ...

statistics - In one history class, 34 students took an exam. The mean of the ...