The lifespan of a particular type of robotic arm is known to be normally distributed with...

The lifespan of a particular type of robotic arm is known to be normally distributed with a mean of 17 months and a standard deviation of 3 months. Suppose that eight robotic arms are selected at random. What is the probability that exactly four out of the eight robotic arms will have a lifespan which is less than 16 months

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orchestra answered 1 year ago

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