Question: This problem relates to chapter 15 about parameters and sampling distributions I'm confused do i just subtract the number from mean and divide by the

This problem relates to chapter 15 about parameters and sampling distributions

I'm confused do i just subtract the number from mean and divide by the standard deviation?

A manufacturing process produces bags of cookies.The distribution of weights of these bags should have a mean of 15.0 oz and a standard deviation of 0.4 oz.

1.) What is the probability that the weight of a bag of cookies chosen at random is greater than 15.7 oz?

2.) What is the probability that the mean weight of 9 bags is less than 14.9 oz?

3.) What is the probability that the mean weight of 9 bags is between 14.7 oz and 15.2?

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