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On average, a pair of bike tires can last 18 months if used every day. The...

On average, a pair of bike tires can last 18 months if used every day. The length of time bike tires can last is exponentially distributed. Eighty percent of bike tires last at most how long if used every day?

A. Less than 25 months

B. None of the above

C. Almost 29 months

D. About 40 months

Math   Statistics-And-Probability   
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