SOLUTION: According to one study, 61% of the population swallow at least one spider per year in their sleep. Based on this study, what is the probability that exactly 7 of 10 randomly select

Algebra ->  Probability-and-statistics -> SOLUTION: According to one study, 61% of the population swallow at least one spider per year in their sleep. Based on this study, what is the probability that exactly 7 of 10 randomly select      Log On


   

Question 626449: According to one study, 61% of the population swallow at least one spider per year in their sleep. Based on this study, what is the probability that exactly 7 of 10 randomly selected people have swallowed at least one spider in their sleep in the last year?

A. 70%


B. 22%


C. 1%


D. 34%

Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
According to one study, 61% of the population swallow at least one spider per year in their sleep. Based on this study, what is the probability that exactly 7 of 10 randomly selected people have swallowed at least one spider in their sleep in the last year?
------
Binomial Problem with n = 10 and p(spider) = 0.61
--
P(x = 7) = 10C7(0.61)^7 * (0.39)^3 = 0.22
======
Cheers,
Stan H.
========
===================
A. 70%
B. 22%
C. 1%
D. 34%