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For 300 trading​ days, the daily closing price of a stock​ (in $) is well modeled...

For 300 trading​ days, the daily closing price of a stock​ (in $) is well modeled by a Normal model with mean ​$196.61 and standard deviation ​$7.18. According to this​ model, what is the probability that on a randomly selected day in this period the stock price closed as follows. ​

a) above ​$203.79​? ​

b) below ​$210.97​? ​

c) between ​$182.25 and ​$210.97​? ​

d) Which would be more​ unusual, a day on which the stock price closed above ​$208 or below ​$190​?

Math   Statistics-And-Probability   
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