Dwade is thinking about buying a laptop that costs $559, but he would also have to pay 7% sales tax. How much would Dwade pay in
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This kind of problems are solved using Bernoulli's distribution. Everytime you have a win/lose scenario, and you know the probability of winning, and you want
successes over
trials, you have the following probability:
You want the probability of having at least three successes, i.e. you are interested in the cases k=3 and k=4. The corresponding probabilities are
So, the total probability is