What length of pregnancy would be the 40th percentile?

Statistics
Tutor: None Selected Time limit: 1 Day

1.       (to receive full credit you must include a sketch of the normal model, show your calculations, clearly distinguish between z-scores and probability, use correct probability notation, and provide a solution statement referring back to the problem context).

 The lengths of human pregnancies are normally distributed with a mean length of 281 days and standard deviation of 13 days. 


WHAT LENGTH OF PREGNANCY WOULD BE THE 40TH PERCENTILE?

Oct 7th, 2015

Thank you for the opportunity to help you with your question!

X=mean+(Z*sd)

Z at 40th percentile=-0.253

X=281+(-0.253*13)

X=277.71

approximately 278 days

Please let me know if you need any clarification. I'm always happy to answer your questions.
Oct 7th, 2015

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Oct 7th, 2015
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