Friday

April 25, 2014

April 25, 2014

Posted by **terry** on Monday, July 19, 2010 at 6:48pm.

a. percentages of scores less than 100

b. relative frequency of scores less than 120

c.percentage of scores less than 140

- statistics -
**MathGuru**, Monday, July 19, 2010 at 9:02pmHere are a few hints:

a. The mean divides a distribution in half: 50% of the distribution is above the mean and 50% of the distribution is below the mean.

b. A score of 120 is one standard deviation above the mean.

c. A score of 140 is two standard deviations above the mean.

I'll let you take it from here.

- statistics -
**Rose**, Thursday, July 22, 2010 at 6:52pma. 50%

b. 0.84

c. 97.72%

**Related Questions**

statistics - assume that a set of test scores is normally distributed with a ...

statistics - Using teh 68-95-99.7rule. Assume that a set of test scores is ...

statistics - Using the 68-95-99.7 rule: Assume that a set of test scores is ...

statistics - Using the 68-95-99.7 rule: Assume that a set of test scores is ...

statistics - using the 68- 95-99.7 rule: Assume that a set of test scores is ...

statistic - Using the 68-95-99.7 rule: Assume that a set of test scores is ...

statistics - Assume that a set of test scores is normally distributed with a ...

stats - Using the 68-95-99.7 rule: Assume that a set of test scores is normally ...

statistics - Using the 68-95-99.7 rule: Assume that a set of test scores is ...

statics - Using the 68-95-99.7 rule: Assume that a set of test scores is ...