Homework Help: statistics

Posted by ann on Saturday, August 20, 2011 at 7:28pm.

Assume that a set of test scores is normally distributed with a mean of 100 and a standard deviation of 20. Use the 68-95-99.7 rule to find the following quantities:
Suggest you make a drawing and label first…
a. Percentage of scores less than 100

b. Relative frequency of scores less than 120

c. Percentage of scores less than 140

d. Percentage of scores less than 80

e. Relative frequency of scores less than 60

f. Percentage of scores greater than 120

statistics - PsyDAG, Sunday, August 21, 2011 at 11:49am
Calculate Z score of each value, then apply the rule.

Z = (score-mean)/SD

Answer this Question

Related Questions

statistics - Assume that IQ scores are normally distributed with a mean of 100 ...
statistics - Assume that a set of test scores is normally distributed with a ...
statistics - Assume that a set of test scores is normally distributed with a ...
statistics - Assume that a set of test scores is normally distributed with a ...
statistics - Assume that a set of test scores is normally distributed with a ...
Statistics - Assume that a set of test scores is normally distributed with a ...
statistics - assume that a set of test scores is normally distributed with a ...
Word Problem - A math teacher gives two different tests to measure students'...
Statistics... I need help - . Assume that a set of test scores is normally ...
statistics - Assume that a set of test scores is normally distributed with a ...

For Further Reading

First Name:
School Subject:
Answer: