The distribution of the number of viewers for the American Idol television show follows a normal distribution

Question:

The distribution of the number of viewers for the American Idol television show follows a normal distribution with a mean of 29 million and a standard deviation of 5 million. What is the probability next week’s show will:
a. Have between 30 and 34 million viewers?
b. Have at least 23 million viewers?
c. Exceed 40 million viewers?

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