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miv72 [106K]
3 years ago
15

Write an equation for the description. the sum of 17 and a number x is equal to 21

Mathematics
2 answers:
pychu [463]3 years ago
8 0
<h2><u>Answer:</u></h2><h3>17+x = 21</h3><h3 /><h3>(i did the math assignment)  </h3>

lawyer [7]3 years ago
7 0

Answer:

Equation: 17+x=21

btw x=4

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Answer:

Option D.

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Suppose that we have a set of N values:

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M = \frac{(x_1 + x_2 + x_3 ... + x_n)}{N}

Because here we have "the median" then we will assume that N is odd, and there is only one median, the value "k"  (if N was even, the median would be the mean of the two middle values, that case is really similar to the case where N is odd, so solving only one of the cases is enough)

Now we add 7 to all the values greater than the median

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Because the mean is computed as the sum of the numbers divided by N, and the mean does not change, and N does not change, then the sum of the numbers does not change.

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SD = \sqrt{\frac{(x_1 - M)^2 + ... + (xn - M)^2}{N} }

Because M does not change, if we add or subtract numbers to some of the values, the standard deviation will change (Because all the terms are squared, so the added and subtracted sevens don't cancel like in the previous cases)

Then the only value that does not have the same value in both the original and new data sets is the standard deviation.

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