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January 29, 2015

January 29, 2015

Posted by **kevin** on Sunday, March 28, 2010 at 7:51pm.

(a) What percent of students earned a score between 50% and 70%?

(b) If 60 students took the exam, how many got a score between 50% and 70%?

- math -
**PsyDAG**, Monday, March 29, 2010 at 12:21pmZ = (x - μ)/SD

Z = (x -50)/10

a) Get the respective Z scores. Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion between the two Z scores.

b) Multiply the proportion above by 60.

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