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 47.0 months and a standard deviation of 8.9 months.
(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.)
A      %

(b) If Quick Start does not want to make refunds for more than 6% of its batteries under the full-refund guarantee policy, for how long should the company guarantee the batteries (to the nearest month)?
B     months

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