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the lifetime of a calculator manufactured by texas instruments with a mean of 5 years and...

the lifetime of a calculator manufactured by texas instruments with a mean of 5 years and standard deviation of 8 months.The company guarantees that any calculator that start manufacturing within 48 months of the purchase will be replaced by a new one.What percentage of calculators made by this company is expected to be replaced?

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Answer:-

Given that:-

the lifetime of a calculator manufactured by texas instruments with a mean of 5 years and standard deviation of 8 months.The company guarantees that any calculator that start manufacturing within 48 months of the purchase will be replaced by a new one.

What percentage of calculators made by this company is expected to be replaced?

Mean , Standard deviation

Hence 6.68%of the clculators are expected to be replaced.

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