The weight of a randomly selected shipping container follows an unknown distribution with mean 12 tons and standard deviation 2 tons. Your cargo ship always carries a load of 100 randomly selected shipping containers.
a. What is the probability the load weighs more than 1,231 tons?
b. What is the 90th percentile of load weights?
I know that I need to use the z-score for part B, but I'm not sure how to find the probability of part A.
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