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A distribution of values is normal with a mean of 278.8 and a standard deviation of...

A distribution of values is normal with a mean of 278.8 and a standard deviation of 18.6.

Find the probability that a randomly selected value is between 261.7 and 301.9.
P(261.7 < X < 301.9) =

*please show all calculations and steps*

Math   Statistics-And-Probability   
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