The weights of newborn babies are distributed normally , with a mean of approximately 100 oz and a standard deviation of 20 oz . If a newborn baby is selected at random , what is the probability that the baby weighs less than 160 oz ?
Answer: The probability is
P(X<150) = P((X-mean)/s <(150-100)/25)
=P(Z<2) = 0.977 (from standard normal table)
Mathematics
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