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Vanyuwa [196]
2 years ago
15

Help…………….^^^^^^^^^^^^^^^^^^^

Mathematics
2 answers:
Tema [17]2 years ago
7 0

8a - 2b + 5a + 1b - 6 \\  \\ =  13a - 1b - 6 \\  \\  \huge \fbox{Option C}

Hope This Helps You ❤️

sergey [27]2 years ago
6 0

Answer:

C) 13a - 1b - 6

Step-by-step explanation:

8a + 5a = 13a

-2b + 1b = -1b

-6 is fine on its own.

Put it all together: 13a -1b -6

Hope this helps, good luck! :D

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A teacher was interested in knowing the amount of physical activity that his students were engaged in daily. He randomly sampled
klasskru [66]

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The standard error of the mean is 4.5.

Step-by-step explanation:

As we don't know the standard deviation of the population, we can estimate the standard error of the mean from the standard deviation of the sample as:

\sigma_{\bar{x}}\approx\frac{s}{\sqrt{n}}

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The mean of the sample is:

\bar{x}=\frac{1}n} \sum x_i =\frac{30+40+60+80+20+85}{6}=52.5

The standard deviation of the sample is calculated as:

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Then, we can calculate the standard error of the mean as:

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6 0
3 years ago
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