In recent years, the New York Stock Exchange's trading volume has increased. The average daily volume for the first two weeks of January 2018 was 646 million shares. The daily volume probability distribution is roughly normal, with a standard deviation of around 100 million shares. a. What are the probabilities that the trading volume will be under 400 million shares? b. What percent of the time does the volume of trade reach 800 million shares? c. What volume will trigger a press release if the exchange wishes to issue one on the top 5% of trading days?

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