The length of pregnancies are normally distributed with a mean of 268 days and a

Question

The length of pregnancies are normally distributed with a mean of 268 days and a standard deviation of 15 days. If we stipulate that a baby is premature if born at least three weeks early, what fraction of babies are born prematurely? 0.0808 0.0668 0.0571 0.0485 Few years ago, in a letter to "Dear Abby" a wife claimed to have given birth 300 days after a brief visit from her husband, who was serving in the Navy. What is the probability that her husband was the actual father of the baby, that is, the probability of a pregnancy lasting 300 days or longer? 0.0228 0.0166 0.0099 0.0068 What middle interval (of days) includes 0.95 fraction of all pregnancies? Round the days to the nearest integer. 252 285 249 287 243 293 239 297 Weight of newborn babies in the United States is normally distributed, with a standard deviation of 500 grams. The fraction of newborn babies who weight less than 2500 grams is 0.0359. What fraction weight more than 4000 grams? 0.1379 0.1230 0.1151 0.1056

Explanation / Answer

solution:-
17) option a. 0.0808
  
Explanation:- 3 weeks = 21 days.
z = -21/15 = -7/5.
From the table of normal distribution , the prob. is 0.08

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