You can probably use the rule explained here: 68-95-99.7 rule - Wikipedia, the free encyclopedia

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- Apr 24th 2009, 12:04 AM #1

- Joined
- Sep 2007
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- 81

## How many given mean and 1SD?

There are 200 students in a class when they have a test.

If the average mar was 29.8 / 50, and the SD was 10 marks, how many students scored 45 or above?

If anyone can run me through how to do this problem without having any statistics knowledge would be appreciated.

- Apr 24th 2009, 04:40 AM #2
You can probably use the rule explained here: 68-95-99.7 rule - Wikipedia, the free encyclopedia