The weight of a small Starbucks coffee is a normally distributed random variable with a mean of 310 grams and a standard deviation of 10 grams. Find the weight that corresponds with each event. (Round your final answers to 2 decimal places)

a) Highest 10 percent _____

b) Middle 50 percent ______ to ______

c) Highest 80 percent_______

d) Lowest 10 percent_______

Could I also get an explanation on how to calculate the z score using excel and appendix C table? Is there a good Youtube or something that would provide a good explanation for this?