The weights of ice cream cartons are normally distributed with a mean weight of 9 ounces and a standard deviation of 0.3 ounce. ​(a) What is the probability that a randomly selected carton has a weight greater than 9.06 ​ounces? ​(b) A sample of 36 cartons is randomly selected. What is the probability that their mean weight is greater than 9.06 ​ounces?

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