2 years ago

Which is a good comparison of the estimated sum and the actual sum of 7 7/8 + 2 11/12?

Mathematics

2 answers:

aleksley [76]2 years ago

5 0

Answer:27.20833333

Step-by-step explanation: all you do is add them up and pick b or a for the answers

Amanda [17]2 years ago

3 0

Answer:

*thinking*

you would assume that it is 11 the actual is 10 19/24

Wich is not quite 11

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stepladder [879]

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3 years ago

Please teach me on how to answer this question. (addmath question)

arsen [322]

We know that $\overline{x}=8$ so:

$\overline{x}=8\\\\\\\dfrac{\sum\limits_{k=1}^7\,x_k}{7}=8\qquad|\cdot7\\\\\\ \boxed{\sum\limits_{k=1}^7\,x_k=56}$

We want to calculate:

$\sum\limits_{k=1}^7\,\big(2x_k-3\big)^2=\sum\limits_{k=1}^7\,\big(4x_k^2-12x_k+9\big)=\\\\\\=\sum\limits_{k=1}^7\,4x_k^2-\sum\limits_{k=1}^7\,\big12x_k+\sum\limits_{k=1}^7\,9=4\sum\limits_{k=1}^7\,x_k^2-12\sum\limits_{k=1}^7\,x_k+\sum\limits_{k=1}^7\,9=\\\\\\=4\cdot672-12\cdot56+7\cdot9=2688-672+63=\boxed{2079}$