SOLUTION: The results of a survey revealed that 30% of the people surveyed said that they would buy home electronic equipment at post-holiday sales. If 20 people are selected, find the proba

Question 925597: The results of a survey revealed that 30% of the people surveyed said that they would buy home electronic equipment at post-holiday sales. If 20 people are selected, find the probability that 8 OR 9 will purchase home electronic equipment at the post-holiday sales. (Round to 4 decimal places
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!
p(buy electronics)= .30, n = 20
Using a TI calculator 0r similarly a Casio fx-115 ES plus
P(x = 8 0R x = 9) = binompdf(20, .30, 8) + binompdf(20, .30 9) = .1144 + .0654 = .1798 0r 17.98%
...By Hand
P(x = 8 0R x = 9) = 20C8(.3)^8(.7)^12 + 20C9(.3)^9(.7)^11
Let me know this works for You.
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