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Georgia [21]
3 years ago
9

PLEASE HELP ME I WILL MARK YOU!!!!!!!!!

Mathematics
2 answers:
katrin2010 [14]3 years ago
5 0

its C michael jogs 20 miles in 10 days.

vlada-n [284]3 years ago
3 0

Answer:

It's C. 20 miles.


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2√6 ∙ √8 + 2√12<br><br>show your work please and thank you
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Answer:

Step-by-step explanation:

multiply first,

so 2√6 x √8 = 2√48 (because when radicals are multiplied we add them)

so

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Read 2 more answers
The number of cars sold annually by used car salespeople is normally distributed with a standard deviation of 16. A random sampl
Kazeer [188]

Answer:

The 90% confidence interval is (64.0101, 68.9899).

Step-by-step explanation:

Our sample size is 310.

The first step to solve this problem is finding our degrees of freedom, that is, the sample size subtracted by 1. So

df = 310-1 = 309.

Then, we need to subtract one by the confidence level \alpha and divide by 2. So:

\frac{1-0.90}{2} = \frac{0.10}{2} = 0.05

Now, we need our answers from both steps above to find a value T in the t-distribution table. So, with 309 and 0.05 in the two-sided t-distribution table, we have T = 1.65

Now, we find the standard deviation of the sample. This is the division of the standard deviation by the square root of the sample size. So

s = \frac{16}{\sqrt{310}} = 1.2060

Now, we multiply T and s

M = 1.65*1.2060 = 1.9899

Then

LCL is the mean subtracted by M. So:

LCL = 66 - 1.9899 = 64.0101

UCL is the mean added to M. So:

LCL = 66 + 1.9899 = 68.9899

The 90% confidence interval is (64.0101, 68.9899).

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3 years ago
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