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Normal distribution

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The average stock price for companies making up the S&P 500 is $30, and the standard deviation is $8.20. Assume the stock prices are normally distributed.
a. What is the probability a company will have a stock price of at least $40?
b. What is probability a company will have a stock price no higher than $20?
c. How high does a stock price have to be to put a company in the top 10%?

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Probability valculations based on normal distribution

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The average stock price for companies making up the S&P 500 is $30, and the standard deviation is $8.20. Assume the stock prices are normally distributed.

a. What is the probability a company will have a stock price of at least $40?

Mean=M= $30.00
Standard deviation ...

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