3 years ago

A line point has its end points at -9 and 6. find the coordinate of the midpoint of the segement

1 answer:

5 0

The midpoint of A = a i B = b: $\dfrac{a+b}{2}$

A = -9; B = 6

$\dfrac{-9+6}{2}=\dfrac{-3}{2}=-1.5$

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$X =4.94\ in$

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For a standard normal distribution of mean $\mu_z = 0$ and $\sigma_z = 1$

the statistic $Z = \frac{X - \mu}{\sigma}$

In this problem we look for the value of X that is 2 standard deviations above the mean.

If there are two standard deviations above the mean, then, in the standard normal distribution, the statistic $Z = 2$ .

Then, we clear X.

$2 = \frac{X -\mu}{\sigma}\\\\2\sigma = X - \mu\\\\\2\sigma + \mu = X\\\\$

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$\sigma=0.52\\\\\mu=3.9\\\\X = 2(0.52) + 3.9\\\\X =4.94$

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AysviL [449]

The answer would be A because 3.90 x 3.5 is equal to 13.65

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