Batteries 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 3. months and a standard deviation of 8 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? (b) (Inverse Normal Distribution) If Quick Start does not want to make refunds for more than 10% of its batteries under the full-refund guarantee the batteries (to the nearest month)?
Batteries 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 3. months and a standard deviation of 8 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? (b) (Inverse Normal Distribution) If Quick Start does not want to make refunds for more than 10% of its batteries under the full-refund guarantee the batteries (to the nearest month)?
A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
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Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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Transcribed Image Text:Batteries 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
3.
months and a standard deviation of 8 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?
(b) (Inverse Normal Distribution) If Quick Start does not want to make refunds for more than 10% of its
batteries under the full-refund guarantee the batteries (to the nearest month)?
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