if the mean is 70 minutes, then 90 minutes is 2 standard deviations above 70. if you look at the bell curve i drew, the percent of exams that took over 90 minutes is 2.5%
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Hii!

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3v+4w-1
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We use the distributive property to "distribute" the minus sign.
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<em>Simplify!</em>
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. <em>Which is our final answer.</em>
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<em>Hope that this helped! Best wishes.</em>
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Answer:
-18 is the right answer..
From the Venn diagram, we can gather that there are 35 total objects (6 in both A and B; 15 in A but not B; 10 in B but not A; and 4 in neither A nor B), and we have the probabilities

(this is the answer)

By definition of conditional probability,


A loss of yardage is generally considered to be a negative gain. That is the total gain in yardage for the two plays is
... -3 + (-4) = -7 . . . . total gain in 2 plays
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That is, the 2 plays resulted in a loss of 7 yards.