Suppose the lengths of the pregnancies of a certain animal are approximately normally distributed with mean u = 197 days and standard deviation o = 11 days. Complete parts (a) through (c). (a) What is the probability that a randomly selected pregnancy lasts less than 193 days? The probability that a randomly selected pregnancy lasts less than 193 days is approximately 0.3581 . (Round to four decimal places as needed.) (b) What is the probability that a random sample of 16 pregnancies has a mean gestation period of less than 193 days? The probability that the mean of a random sample of 16 pregnancies is less than 193 days is approximately . (Round to four decimal places as needed.)

Question

I've done the equation for this answer, but how do I use the standard normal distribution table to obtain the probability? 

Suppose the lengths of the pregnancies of a certain animal are approximately normally distributed with mean u = 197 days and standard
deviation o = 11 days. Complete parts (a) through (c).
(a) What is the probability that a randomly selected pregnancy lasts less than 193 days?
The probability that a randomly selected pregnancy lasts less than 193 days is approximately 0.3581 . (Round to four decimal places as
needed.)
(b) What is the probability that a random sample of 16 pregnancies has a mean gestation period of less than 193 days?
The probability that the mean of a random sample of 16 pregnancies is less than 193 days is approximately . (Round to four decimal places
as needed.)
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Transcribed Image Text

Suppose the lengths of the pregnancies of a certain animal are approximately normally distributed with mean u = 197 days and standard deviation o = 11 days. Complete parts (a) through (c). (a) What is the probability that a randomly selected pregnancy lasts less than 193 days? The probability that a randomly selected pregnancy lasts less than 193 days is approximately 0.3581 . (Round to four decimal places as needed.) (b) What is the probability that a random sample of 16 pregnancies has a mean gestation period of less than 193 days? The probability that the mean of a random sample of 16 pregnancies is less than 193 days is approximately . (Round to four decimal places as needed.)

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