What expressions are equivalent to -3.5(2-3n)-2.5n?

1 answer:

6 0

−3.5(2−3n)−2.5nDistribute:=(−3.5)(2)+(−3.5)(−3n)+−2.5n=−7+10.5n+−2.5nCombine Like Terms:=−7+10.5n+−2.5n=(10.5n+−2.5n)+(−7)=8n+−7

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Suppose the lengths of the pregnancies of a certain animal are approximately normally distributed with mean mu equals 280 days a

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First, find the z-score:

z = (value - mean) / sdev
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In order to use a standard normal table, we need a positive z-score:
P(z < -0.33) = 1 - P(z < 0.33)

Looking at the table, we find P(z < 0.33) = 0.6293

Therefore:
P(z < -0.33) = 1 - 0.6293 = 0.3707

Hence, you have a probability of about 37% that a randomly selected pregnancy lasts less than 275 days.

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