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g100num [7]
2 years ago
11

Describe the error in the work shown below.Find an expression equivalent to 18 + 30.Factors of 18: 1, 2, 3, 6, 9, 18Factors of 3

0:1,2,3,5,6, 10, 15, 3018 + 30 = 6(3 + 10)​
Mathematics
2 answers:
attashe74 [19]2 years ago
5 0
6(3 + 10) = 6*3 + 6*10 = 18 + 60
As you can see, it's not equivalent to 18+30

To fix it, we can change (3+10) to (3+5)
Now we have 6(3 + 5). And this is now equivalent to 18+30.
Guest1 year ago
0 0

The product of 6 and 10 is 60, so the expressions are not equivalent. The expression should be 6(3 + 5).

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Solution to the problem

For this case we have the following info related to the time to prepare a return

\mu =90 , \sigma =14

And we select a sample size =49>30 and we are interested in determine the standard deviation for the sample mean. From the central limit theorem we know that the distribution for the sample mean \bar X is given by:

\bar X \sim N(\mu, \frac{\sigma}{\sqrt{n}})

And the standard deviation would be:

\sigma_{\bar X} =\frac{14}{\sqrt{49}}= 2

And the best answer would be

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