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The upper leg length of twenty-year old males is normally distributed with a mean length of...

The upper leg length of twenty-year old males is normally distributed with a mean length of 43.7 cm and a standard deviation of 4.2 cm.

a. What is the probability that a randomly selected twenty-year old male has an upper leg length that is less than 40 cm?

b. A random sample of 12 males who are twenty-year old is obtained. What is the probability that the mean upper leg length is less than 40 cm?

Math   Statistics-And-Probability   
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