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A Group of 625 Students Has a Mean Age of 15.8

Question 33

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A group of 625 students has a mean age of 15.8 years with a standard deviation of 0.6 years. If the random variable x = Age is normally distributed,
a) What is the probability that a student will be younger than 16.2 years?
b) How many students are older than 16.2 years?

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a)
blured image = 15.8; blured image = 0.6
blured image
P(x < 16....

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