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?

Question

anonymous · Answer

That statistic is fiction. Spiders are a living creature with a sense of self preservation. If spiders crawled into open mouths all the time, their numbers would suffer greatly.

nurali · Answer

P(x = 7) = 10C7(0.61)^7 * (0.39)^3 = 0.22

nurali · Answer

It would be 22%. It's simple math.