Sir i am stuck for this question

Question - 1 The average time to deliver a pizza is 20 minutes with a standard deviation of 5 minutes. You want to run a marketing campaign that says \"we deliver the burger in 30 minutes if we take more time it is free". This could also cost you in case of late deliveries. So you do not want to be giving away for more than 2% of the times. Will you go in for the campaign or not? Question 2 The average amount of caffeine in a drink is 250 mg with a standard deviation of 25 mg. The Sports drug authority failed about 10% of the participants due to "excess caffeine". What is the limit set by the Sports Authority to eliminate the participants