A manufacturer knows that their items have a normally distributed lifespan, with a mean of 10.9 years, and standard devi

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A Manufacturer Knows That Their Items Have A Normally Distributed Lifespan With A Mean Of 10 9 Years And Standard Devi 1 (9.82 KiB) Viewed 6 times

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A manufacturer knows that their items have a normally distributed lifespan, with a mean of 10.9 years, and standard deviation of 3.5 years. If you randomly purchase one item, what is the probability it will last longer than 11 years? Round answer to three decimal places
In the country of United States of Heightlandia, the height measurements of ten-year-old children are approximately normally distributed with a mean of 53.6 inches, and standard deviation of 6.1 inches. What is the probability that the height of a randomly chosen child is between 57.75 and 68.65 inches? Do not round until you get your your final answer, and then round to 3 decimal places. (Round your answer to 3 decimal places.) Answer=
A manufacturer knows that their items have a normally distributed length, with a mean of 5 inches, and standard deviation of 1.2 inches. If one item is chosen at random, what is the probability that it is less than 6.3 inches long?