Friday

January 30, 2015

January 30, 2015

Posted by **Norilyn** on Tuesday, March 15, 2011 at 4:23pm.

A teacher informs her history class that a test is very difficult, but the grades would be curved. Scores for the test are normally distributed with a mean of 25 and a standard deviation of 5. If the grades are curved according to the following scheme, find the numerical limits for each grade.

A: Top 10%

B: Scores above the bottom 70% and below the top 10%

C: Scores above the bottom 30% and below the top 30%

D: Scores above the bottom 10% and below the top 70%.

F: Bottom 10%

- Statistics -
**PsyDAG**, Tuesday, March 15, 2011 at 11:55pmZ = (score-mean)/SD

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportions and their Z scores. Insert the values into equation above to find the scores.

**Answer this Question**

**Related Questions**

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

STATISTICS - A Statistics teacher has the following test scores : 93, 72, 80, 95...

statistics - Suppose that you have just taken a test and earned a score of 90%. ...

VERY URGENT SCIENCE - A science teacher was curious to see whether offering ...

statistics - below is the test scores for students in a statistics class.80,65,...

statistics! - 1) Entry to a certain University is determined by a national test...

statistics - . A professor is interested in knowing the correlation, if any, of ...

Science - A science teacher was curious to see whether offering money for good ...

Science - A science teacher was curious to see whether offering money for good ...

statistics - the admissions policy at a certain university requires that ...