Instruction
Suppose that ice cream consumption per person at parties is normally distributed with a mean of 0.21 gallons, and a standard deviation of 0.13 gallons. If you are throwing a party with 68 guests, how much ice cream do you need to buy to make sure that the probability of having enough is 95%? Round up to the next gallon. Do not use units in your answer.
I need to know how to solve this using excel