Part B. Now suppose that the pH measurements of the field from the question above actually follow a normal distribution

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Part B. Now suppose that the pH measurements of
the field from the question above actually follow a normal
distribution with mean 6 pH and standard deviation 0.6 pH. Assuming
that each pH measurement is independent of each other, what is the
probability that the engineer obtains a sample mean
(with n = 12) greater than 6.33 pH? Round your answer
to four decimal places.
What about the 75-th percentile of the sample mean
(with n = 12) that the engineer could obtain? Round
your answer to four decimal places.