A manufacturer knows that their items have a normally distributed lifespan, with a mean of 7.4 years, and standard deviation of
2.3 years. If you randomly purchase one item, what is the probability it will last longer than 4 years?
1 answer:
Answer: 0.9306
Step-by-step explanation:
Given : A manufacturer knows that their items have a normally distributed lifespan, with a mean of 7.4 years, and standard deviation of 2.3 years.
i.e.
Let x denotes the lifespan of the items.
Then, the probability it will last longer than 4 years will be :-
Hence , our required probability = 0.9306
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