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The length of country and western songs is normally distributed and has a mean of 200 seconds and a standard deviation of 40 seconds. Find

The length of country and western songs is normally distributed and has a mean of 200 seconds and a standard deviation of 40 seconds. Find the probability that a random selection of 40 songs will have mean length of 191.5 secs or less. Assume the distribution of the lengths of the songs is normal.

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