Sunday

January 25, 2015

January 25, 2015

Posted by **Anonymous** on Monday, September 17, 2012 at 10:34pm.

- Statistics -
**MathGuru**, Tuesday, September 18, 2012 at 4:59pmUse z-scores.

Find two z-scores using this formula:

z = (x - mean)/sd

Mean = 30.9

Sd = 2.08

Use 25 for x to determine first z-score.

Use 28.5 for x to determine second z-score.

Once you have both z-scores, check a z-table for the probability between the two scores. Convert to a percent.

I hope this will help get you started.

**Answer this Question**

**Related Questions**

math - Reading readiness of preschoolers from an impoverished neighborhood (n = ...

Math - Reading readiness of preschoolers from an impoverished neighborhood (=20...

math - Reading readiness of preschoolers from an impoverished neighborhood (n=20...

Statistics - If student A scored 42 on a test of reading and the test had a ...

statistics - Scores on the Stanford Binet Intelligence Scale (SBIS) are ...

graduate statistics - Does computer-assisted instruction help community college ...

CRJ303-Statistics question - Re-worded from the "Study Questions" part of ...

Statistics - A district mathematics test for all third graders had a normal ...

Math - if there are 145 test questions, and the mean of the test scores for a ...

Statistics - On a chemistry exam, Student A scored a 81 and Student B scored a ...