Scenario 6-9 The weights of grapefruits of a certain variety are approximately Normally distributed with a mean of 1 pound and a standard deviation of 0.12 pounds. Use Scenario 6-9. What is the probability that the total weight of three randomly selected grapefruits is more than 3.4 pounds?

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anonymous · Answer

I know the answer, I just really wanna know how to do it.. what formula to use.. or where to start.  I have tried standardizing, but I am not sure, because I just multiplied everything by 3 then did x - xbar / sigma