Peter works at a bookstore. He packed 3 identical paperbacks and 2 identical textbooks in a box. The total mass of the books was
2 answers:
Answer:
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Peter works at a bookstore. He packed 3 identical paperbacks and 2 identical textbooks in a box. The total mass of the books was 22.6 pounds. After he put 3 more textbooks and 1 more paperback in the box, the total mass of the books was 46 pounds.
The weight of the 3 textbooks and 1 paperback was <u>23.4 pounds.</u>
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Step-by-step explanation:
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From the definition of conditional probability,
and by the law of total probability,
In other words, each cell in the grid left of and above the total column and row represents the joint probabilities (e.g.
). So,
and by the law of total probability,
In other words, each cell in the grid left of and above the total column and row represents the joint probabilities (e.g.
We have
Multiplying through by 1100,
Squaring (which means we need to check later),
Clearly there's no way that giant number would work; must be extraneous.
Answer: 3.94
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