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MatroZZZ [7]
2 years ago
6

6. The value of the polynomialx2 -x -1 at x = -1 is *​

Mathematics
1 answer:
Licemer1 [7]2 years ago
7 0

Answer:

-2

Step-by-step explanation:

Replace x with -1

(-1)2 - (-1) - 1

-2 + 1 - 1

-2

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First, find the mean. You'll need it to compute the variance.

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The variance of the sample is then computed with the formula

s^2=\displaystyle\dfrac1{5-1}\sum_{i=1}^5(\bar x-x_i)^2=\dfrac{(21-11)^2+\cdots+(11-11)^2}4=\dfrac{71}2=35.5

The standard deviation is the square root of the variance, so

s=\sqrt{35.5}\approx5.958
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Step-by-step explanation:

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2 years ago
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