A company produces breakfast cereal. The true mean weight of the

A company produces breakfast cereal. The true mean weight of the contents of its cereal packages is 20 ounces, and the standard deviation is 0.6 ounce. The population distribution of weights is normal. Suppose that you purchase four packages, which can be regarded as a random sample of all those produced.
a. What is the standard error of the sample mean weight?
b. What is the probability that, on average, the contents of these four packages will weigh fewer than 19.7 ounces?
c. What is the probability that, on average, the contents of these four packages will weigh more than 20.6 ounces?
d. What is the probability that, on average, the contents of these four packages will weigh between 19.5 and 20.5 ounces?
e. Two of the four boxes are chosen at random. What is the probability that the average contents of these two packages will weigh between 19.5 and 20.5 ounces?

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