Posted by **mary** on Wednesday, April 13, 2011 at 9:47am.

weekly take home pay for those 20 graduate teaching assistants from university z:

500.75, 217.43, 488.25, 405.78

485.46, 495.48, 370.75, 435.40

479.65, 482.56, 470.28, 489.90

382.50, 500.75, 465.32, 481.25

506.43, 225.50, 504.38, 179.25

1. what are the mean and standard deviation for this distribution of weekly take-home pay amounts?

2. what percentage of the pay amounts lie within 1 standard deviations of the mean?

3. what percentage of the pay amounts lie within 2 standard deviations of the mean?

4. what percentage of the pay amounts lie within 3 standard deviations of the mean?

5. what is the range of the pay amounts?

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