Claire mowed 7 lawns last week. she mowed each lawn in 7/12 hour. she mowed the same lawns this week in 5/12 hour. how many times longer was claires time to mow all the lawns last week than this week?

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.