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Suppose we have a mound-shaped distribution with a mean of 50 and a standard deviation 10. 1. About what proportion of the observations are within

Suppose we have a mound-shaped distribution with a mean of 50 and a standard deviation 10.

1. About what proportion of the observations are within 2 standard deviations?

2. About what proportion of the observations are between 30 and 50?

3. About what proportion of the observations are above 70?

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