SOLUTION: The lengths of a particular animal's pregnancies are approximately normally distributed, with mean muequals250 days and standard deviation sigmaequals12 days.
(a) What pr
Algebra ->
Probability-and-statistics
-> SOLUTION: The lengths of a particular animal's pregnancies are approximately normally distributed, with mean muequals250 days and standard deviation sigmaequals12 days.
(a) What pr
Log On
Question 1161797: The lengths of a particular animal's pregnancies are approximately normally distributed, with mean muequals250 days and standard deviation sigmaequals12 days.
(a) What proportion of pregnancies lasts more than 256 days?
(b) What proportion of pregnancies lasts between 232 and 259 days?
(c) What is the probability that a randomly selected pregnancy lasts no more than 244 days?
(d) A "very preterm" baby is one whose gestation period is less than 223 days. Are very preterm babies unusual? Answer by Boreal(15235) (Show Source):
You can put this solution on YOUR website! z=(x-mean)/sd
a. z is more than 6/12 or 1/2.That probability is 0.3085
b. z is between -1.5 and +0.75 with probability of 0.7066
c. z is less than -0.5, and since the curve is symmetrical, that is the same answer as a or 0.3085 probability
d. z is less than -2.25 or 0.0122. Uncommon but given the number of babies born is uncommon for sure.
