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A data distribution has a mean of 10 and a standard deviation of 1. Suppose we...

A data distribution has a mean of 10 and a standard deviation of 1. Suppose we do not know if the distribution is bell-shaped or not. Estimate the proportion of data that falls between 9 and 11.

A. Cannot be determined

B. 95%

C. 99.7%

D. 68%

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