The coffee company American Expresso has a promotion where "if you don't get your take away coffee within 180
seconds, it's free!".
American Expresso has commissioned an independent study which found that the time to make a take away coffee at one of their stores is approximately normally distributed with a mean time of 151 seconds and a standard deviation of 21 seconds.
1. Calculate the percentage of take away coffees that are given to customers for free according to the promotion. Give your answer as a percentage to 1 decimal place.
- Percentage of free coffees = jQuery224002749477574647763_1581434056039?
2. .Some shareholders are unhappy with the terms of the promotion and suggest that the time limit should be such that at most only 2.5% of take away coffees are given for free under the promotion.
Calculate the time limit such that this requirement is satisfied. Give your answer as a whole number.