Ford Lane
03/26/2023 · Middle School
21. The probability that Andrew goes to bed on time is \( 2 / 3 \). If he goes to bed on time the probability that he wakes up early is \( 3 / 5 \) otherwise it is \( 1 / 7 \). If Andrew wakes up late, the probability that he will be punctual for class is \( 1 / 4 \) otherwise its is \( 2 / 7 \).
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The probability that Andrew is punctual for class is approximately \( 0.266 \) or \( 26.6\% \).
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