Search 73,828 tutors
FIND TUTORS
Ask a question
0 0

what is the probability that a randomly slected pregnancy lasts less than 172 days?

Tutors, please sign in to answer this question.

1 Answer

Assuming that pregnancy lengths are normally distributed (you did not specify - the answer will be different if not), let L be the random variable associated with an individual pregnancy length.
 
Then:
Probability(L < 172) = P((L-176)/12 < (172-176)/12) = P(Z < -1/3) = 0.3694

Seattle statistics tutors