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Business Travel - Normal Distribution

The Travel Weekly International Air Transport Association survey asked business travelers about the purpose for their most recent business trip. 19% responded that it was for an internal company visit. Suppose 950 business travelers are randomly selected.

a. What is the probability that more than 25% of the business travelers say the reason for the most recent business trip was an internal company visit?

b. What is the probability that between 15% and 20% of the business travelers say that the reason for the their most recent business trip was an internal company?

c. What is the probability that between 133 and171 of the business travelers say the reason for their most recent business trip was an internal company visit?

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