15. [-/0.16 Points] DETAILS BBUNDERSTAT12 6.3.029.5. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Quick Start Company makes 12-volt car batteries. After many years of product testing, the company knows that the average life of a Quick Start battery is normally distributed, with a mean of 45.8 months and a standard deviation of 9.5 months. LO USE SALT (a) If Quick Start guarantees a full refund on any battery that fails within the 36-month period after purchase, what percentage of its batteries will the company expect to replace? (Round your answer to two decimal places.) % (b) If Quick Start does not want to make refunds for more than 9% of its batteries under the full-refund guarantee policy, for how long should the company guarantee the batteries (to the nearest month)? months Need Help? Read It Watch It 16. [-/0.3 Points] DETAILS BBUNDERSTAT12 6.3.038.5. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER The amount of money spent weekly on cleaning, maintenance, and repairs at a large restaurant was observed over a long period of time to be approximately normally distributed, with mean # = $613 and standard deviation o = $44. LO USE SALT (a) If $646 is budgeted for next week, what is the probability that the actual costs will exceed the budgeted amount? (Round your answer to four decimal places.) (b) How much should be budgeted for weekly repairs, cleaning, and maintenance so that the probability that the budgeted amount will be exceeded in a given week is only 0.07? (Round your answer to the nearest dollar.) $