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**Easy probability question help??**

917 983 1046 944 723 783 813 1057 766 836 992 973

Above are the trading volumes (millions of shares) for stocks traded on the NYSE during a certain period.

Assume that the probability distribution of the trading volumes is approximately normal.

2.2 What is the probability that on a particular day the trading volume will be less than 800 million shares?

2.3 What is the probability that on a particular day the trading volume will exceed 1 billion shares?

2.4 If the exchange wants to issue a press release on the top 5% of trading days, what volume will trigger a press release??

This is not homework i am trying to explain this to my brother and don't know how too, answers with working out would be required.