Why a linear function may not be adequate for describing the supply and demand function

How do you convert 1.27 to a percentage

Assume that the weights of quarters are normally distributed with a mean of 5.67 g and a standard deviation 0.070 g. a vending machine will only accept coins weighing between 5.48 g and 5.82 g. what percentage of legal quarters will be rejected? round your answer to two decimal places.

Look at this pattern ; 1,4,9, number 10000 belongs in this pattern . what’s the place of this number?