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December 20, 2014

December 20, 2014

Posted by **Brittany** on Sunday, February 5, 2012 at 5:58pm.

a) On average, how many of the 20 individuals would be 80 years old or older?

E(x)=np= 20*0.055= 1.1

is this corrected?

b)What is the probability that less than 2 of the 20 individuals are 80 years old or older?

P(x<2)=P(x=0)+P(x=1)= 0.6980679

is this corrected?

- statistics -
**MathGuru**, Sunday, February 5, 2012 at 6:36pmLooks good to me! Good job!

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