Question 211052: Having lots of trouble mapping this out. Please help.
If 4.1% of the population of Finland lives to the age of 90, what is the probability that of 1000 Finlandians:
a) between 30 and 40 will live to be 90 years old?
b) more than 80 of them will live to be 90 years old?
c) less than 20 of them will like to be 90 years old?
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! If 4.1% of the population of Finland lives to the age of 90, what is the probability that of 1000 Finlandians:
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The populatin mean is 0.041; the standard deviation is sqrt(0.041*0.959)
= 0.1983
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I'm using a TI calculator to get the answers below.
a) between 30 and 40 will live to be 90 years old?
Ans: binomcdf(1000,0.041,40) - binomcdf(1000,0.041,29)= 0.4493..
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b) more than 80 of them will live to be 90 years old?
Ans: 1 - binomcdf(1000,0.041,80) = 0.0000000099057
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c) less than 20 of them will like to be 90 years old?
Ans: binomcdf(1000,0.041,19) = 0.00007855
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Cheers,
Stan H.
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