Using a normal model to describe children heights?

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Suppose the heights of kindergarten children can be described by a normal model with a mean of 38.2 inches and standard deviation of 1.8 inches.

1. what fraction of kindergarten kids can we expect to be less than 3 feet tall?

Oct 5th, 2015

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

3ft = 36in

Z= 36-38.2/1.8 = -1.22

P (x <36)=0.112

Please let me know if you need any clarification. I'm always happy to answer your questions.
Oct 5th, 2015

If the z=-1.22 how did you get to 0.112?

And how would I determine what fraction of kindergartners are taller than 42 in?

I see the answer but don't know how to get there.

Oct 5th, 2015

normal cdf (-99, -1.222) = 0.1109

about 11.09% of kinder-kids should be less than 3 feet tall

Oct 5th, 2015

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