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The life expectancy of vacuum cleaner is normally distributed with a mean of 48 months and...

The life expectancy of vacuum cleaner is normally distributed with a mean of 48 months and a standard deviation of 12 months. 90% of the vacuum cleaners will have a life expectancy of at least how many months?

(a)28.3 (b)32.6 (c)46.4 (d)67.7 (e)49.6

Math   Statistics-And-Probability   
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Answer #1

answer is 32.6

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