Question 1098573: Market-share-analysis company Net Applications monitors and reports on Internet browser usage. According to Net Applications, in the summer of 2014, Google's Chrome browser exceeded a 20% market share for the first time, with a 20.37% share of the browser market (Forbes website, December 15, 2014). For a randomly selected group of 20 Internet browser users, answer the following questions.
a. Compute the probability that exactly 8 of the 20 Internet browser users use Chrome as their Internet browser (to 4 decimals). For this question, if you compute the probability manually, make sure to carry at least six decimal digits in your calculations.
20!
________ * (.2037)8 * (.7963)12 =
8! 12 !
(.000002964) * (.06500082) = .000000193
This is not right, not sure what I'm doing wrong. I would appreciate any help to get me on the right track.
Answer by Theo(13342)   (Show Source):
You can put this solution on YOUR website! n = 20
x = 8
p = .2037
q = .7963
p(8) = c(20,8) * .2037^8 * .7963^(12)
this is equal to 125970 * 2.964341486 * 10^-6 * .0650010824
this is equal to 125970 * 1.926854053 * 10^-7
multiply by 125970 and you get p(8) = .0242725805
it looks like you didn't multiply by c(20,8).
otherwise your work looked good.
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