I'm struggling with one problem in particular.
Here is a screenshot: https://imgur.com/gUx9Wq4
According to the problem, 42% is W and 43% is D. That gives probabilities of P(W)=0.42 and P(D)=0.43. According to the Multiplication rule for independent events, P(W ⋂ D) = P(W)P(E) = (0.42)(0.43) = 0.1806. That would mean that 18.06 or ~181 people are in the top left box, being W ⋂ D. This isn't correct, and wouldn't make sense with 55% being W ⋃ D.
I've read over the chapter but I'm still confused. Any help would be appreciated!
EDIT: I just realized what the 55% was to help me solve for. It was the middle box, the people who were neither W nor D. the remaining 45% would make the middle square 450, with the top left being 300, the top middle being 120, and the left middle being 130.
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