The certain paper suggested that a normal distribution with mean 3,500 grams and standard deviation 540 grams is a reasonable model for birth weights of babies born in Canada (a) One common medical definition of a large baby is any baby that weighs more than 4,000 grams at birth. What is the probability that a randomly selected Canadian baby is a large baby?   (b) What is the probability that a randomly selected Canadian baby weighs either less than 2,000 grams or more than 4,000 grams at birth?

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The certain paper suggested that a normal distribution with mean 3,500 grams and standard deviation 540 grams is a reasonable model for birth weights of babies born in Canada

(a)
One common medical definition of a large baby is any baby that weighs more than 4,000 grams at birth. What is the probability that a randomly selected Canadian baby is a large baby?
 
(b)
What is the probability that a randomly selected Canadian baby weighs either less than 2,000 grams or more than 4,000 grams at birth?
 
(c)
What birth weights describe the 15% of Canadian babies with the greatest birth weights?
Any baby with a weight of  grams or more is in the greatest 15% of birth weights.
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