Quick Start Company makes 12-volt car batteries. After many years of product tes

Question

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 45.6 months and a standard deviation of 6.9 months.

A) What percent of Quick Start batteries last less than 60.65 OR more than 72.25 months?
--------------%. ( Keep your answer in percentage of 2 decimal places).


B) What percent of Quick Start batteries last no more than 15.35 OR not less than 52.15 months?
--------------- %. ( Keep your answer in percentage of 2 decimal places).


C) What percent of Quick Start batteries last no more than 48.25 OR more than 48.85 months?
---------------- % . (Keep your answer in percentage of 2 decimal places).


D) What percent of Quick Start batteries last less than 52.15 OR not less than 76.45 months?
-------------%. ( Keep your answer in percentage of 2 decimal places)

Explanation / Answer

A) 98.55%

B) 17.13% => P(x<15.35) + P(x>=52.15) = P(x<15.35) + 1- P(x<52.15)

C) 5.37% => 1 - P(x=48.25)

D) 82.88%

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