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15 March, 15:44

A collection of 8 backpacks has a mean weight of 14 pounds. A different collection of 12 backpacks has a mean weight of 9 pounds. What is the mean weight of the 20 backpacks? Explain how you found your answer.

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  1. 15 March, 16:00
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    Total weight of the first 8 backpacks

    8*14

    112 pounds

    Total weight of the second 12 backpacks

    12*9

    108

    Total weight of the whole 20 backpacks

    112+108

    220

    So the mean weight of the 20 backpacks

    220 / 20

    11
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