What's the answer?! Students in Mrs. Barnes's class determined the probability that she will check homework on a randomly chosen day is 0.42. They also determined the probability that she will give a pop quiz when she checks homework is 0.6, and the probability that she will give a pop quiz when she does not check homework is 0.9. The probabilities are displayed in the tree diagram: What is the probability that Mrs. Barnes does not check homework if the students take a pop quiz? 0.25 0.33 0.67 0.77 0.60 Pop quiz Checks homework 0.42 No pop quiz 0.40 Random day Does not check homework 0.90 Pop quiz 0.58 No pop quiz 0.10
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