Posted by **Sabrina** on Saturday, April 28, 2012 at 10:17pm.

A professor informs her class that a test is very difficult, but the grades will be curved. Scores for the test are normally distributed with a mean of 25 and a standards deviation of 5. If she curves the grades by adding 50 to each grade, What is the new mean? What is the new standard deviation?

- statistics -
**PsyDAG**, Sunday, April 29, 2012 at 11:26am
The new mean will be 25+ 50 = ?

The standard deviation will remain the same.

- statistics -
**Angi**, Monday, April 30, 2012 at 9:41am
The new mean is 75 (25 + 50); however the standard deviation stays at 5 because she adds the same amount of points to all grades, so the curve is just shifting up rather than changing shapes.

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