Due to advances in medical science, the probability of a baby born in 2017 will be alive at age 90 is 25 %.  If 400 babies born in 2017 in a particular geographical area.                                                                                What is the probability there will be between 90 and 110   of them alive at age 90?  I'm having trouble figuring out the formula for this problem (how it should be set up), can you help?

College Algebra
7th Edition
ISBN:9781305115545
Author:James Stewart, Lothar Redlin, Saleem Watson
Publisher:James Stewart, Lothar Redlin, Saleem Watson
Chapter9: Counting And Probability
Section: Chapter Questions
Problem 14T: An unbalanced coin is weighted so that the probability of heads is 0.55. The coin is tossed ten...
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Due to advances in medical science, the probability of a baby born in 2017 will be alive at age 90 is 25 %.  If 400 babies born in 2017 in a particular geographical area.                                                                              

 What is the probability there will be between 90 and 110   of them alive at age 90? 

I'm having trouble figuring out the formula for this problem (how it should be set up), can you help?

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