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18 June, 00:10

Mariah has a spinner that has 10 equal sections, each containing a different number from 1 to 10. Mariah determines about how many times the spinner will land on a number that is greater than 7 in 250 spins, and her work is shown below.

P (number greater than 7) = Numbers greater than 7 / Total number of sections times number of spins = 4/10 (250) = 100

What mistake did Mariah make, if any?

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  1. 18 June, 03:25
    0
    She wrote a 4 instead of a 3.

    There are only 3 numbers that are greater than 7. They are 8, 9, and 10. Mariah must have include 7 in her list. That is how she got 4 instead of 3.
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