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please help and explain in detail how to do it. I am not in a rush to get an answer so please explain in detail

please help and explain in detail how to do it.

I am not in a rush to get an answer so please explain in detail so I could understand. Thank you!

  1. Suppose the weight of a newborn baby follows a normal distribution with a mean of 3500 grams and a standard deviation of 600 grams.

a. What is the probability that the weight of a randomly selected newborn exceeds 4000g?

b. For a random sample of 36 newborns, what is the probability that their mean weight is less than 3450g?

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