The mean weight for a newborn baby is 7.5 pounds. The standard devi- ation is 1.2 pounds. Newborn weights, like many bio-metrics, follow a normal distri- bution.
(a) What is the probability of randomly selecting a newborn whose weight is greater than 8.7 pounds? (hint: use the empirical rule)
(b) What is the probability of randomly selecting a newborn whose weight is below 5.5 pounds?
(c) Would you consider it unusual for a newborn to weigh less than 5 pounds? Why or why not?
(d) What is the probability that a random sample of 9 babies have a mean weight greater than 8.7 pounds?
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