whats probability that the mean duration of these pregnancies will be less 260

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assume that the duration od human pregnancies can be described by a normal model with a mean 266 days and standard deviation 16 days.  

Sep 30th, 2015

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

First transform x=260 to z-score:  z=(260-266)/16=- 6/16= -.375

P(z<.375)= .3538

Please let me know if you need any clarification. I'm always happy to answer your questions.
Sep 30th, 2015

This is still a little confusing the final answer that im trying to get is 0.002 but im unsure how to get there

Sep 30th, 2015

sorry,I missed the negative sign of z but the final answer is the same.

In order to get a prob. of .002, z must be equal to -2.87. I have no idea why it should be .002

Sep 30th, 2015

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Sep 30th, 2015
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Sep 30th, 2015
Jun 23rd, 2017
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