2 years ago

Please help me out :)

Mathematics

2 answers:

alex41 [277]2 years ago

4 0

The answer is A. 1023

Ainat [17]2 years ago

3 0

2^0+2^1+....+2^9= 2^10-1= 1024-1=1023

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Step-by-step explanation:

1. First, you must calculate the mean, as following:

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2. Now, you should substract the means obtained to every single number of the set and then square it. Add all of them:

$(12-47.71)^{2}+(16-47.71)^{2}+(22-47.71)^{2}+(23-47.71)^{2}+(34-47.71)^{2}+(44-47.71)^{2}+(46-47.71)^{2}+(47-47.71)^{2}+(48-47.71)^{2}+(64-47.71)^{2}+(67-47.71)^{2}+(73-47.71)^{2}+(83-47.71)^{2}+(89-47.71)^{2}=7984.86$

3. The mean of this is:

$\frac{7984.8574}{14}=570.35$

4. The square root of this result is:

$\sqrt{2.52}=23.88$

5. To the nearest tenth, the result is: 23.9

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