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Toyoto has developed a headlight. The average life of these headlights is 20 months with standard...

Toyoto has developed a headlight. The average life of these headlights is 20 months with standard deviation 5.2 months.

a) If Toyoto has a full refund guarantee for 12 months, what percentage of all headlights sold would they have to replace?

b) If Toyoto wanted to replace 3% or fewer of their headlights, how long should the guarantee period be?

Math   Statistics-And-Probability   
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