My instructor doesn't the students to use a calculator. We are instructed to used Excel only.

I need help figuring out what functions to use to calculate this problem. Thanks

The weight of an energy bar is approximately normally distributed with a mean of 42.35 grams with a standard deviation of 0.045 gram. Complete parts(a) through(e) below.

c. If a sample of 25 energy bars isselected, what is the probability that the sample mean weight is less than 42.315 grams?