I am having trouble getting the mean and standeard deviation. could you please show me how ? thanks

perscription data

0.4-1.1

1.2-1.9

2.0-2.7

2,8-3.5

3.6-4.3

Frequency

2

2

4

3

9

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- Feb 5th 2008, 03:34 PM #1

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- Feb 5th 2008, 03:54 PM #2

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- Feb 5th 2008, 04:25 PM #3

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- Feb 5th 2008, 04:43 PM #4

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