10 Warren Dinner has invested in nine different investments. The profits earned on the different investments are...

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10 Warren Dinner has invested in nine different investments. The profits earned on the different investments are independent. The return on each investment follows a normal distribution, with a mean of $500 and a standard deviation of $100.

a There is a 1% chance that the total return on the nine investment is less than .

b The probability that Warren’s total return is between

$4,000 and $5,200 is .

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