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Gelneren [198K]
3 years ago
13

4 = 2/3 ( x + - 12 )

Mathematics
2 answers:
sergiy2304 [10]3 years ago
7 0

Answer:

X IS EIGHTEEN


Step-by-step explanation:

4=2/3x-8

12=2/3x

divide both sides by 2/3

36/2=18

hichkok12 [17]3 years ago
3 0

Answer:

18 = x

Step-by-step explanation:

4 = 2/3 ( x + - 12 )

4 = 2/3x - 8

+8          + 8

<u>12 = 2/3x</u>

2/3   2/3

18 = x


Sorry if I'm incorrect...

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Step-by-step explanation:

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3 years ago
The estimated daily living costs for an executive traveling to various major cities follow. The estimates include a single room
Alexandra [31]

Answer:

\bar x = 260.1615

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Step-by-step explanation:

Given

n =20

See attachment for the formatted data

Solving (a): The mean

This is calculated as:

\bar x = \frac{\sum x}{n}

So, we have:

\bar x = \frac{242.87 +212.00 +260.93 +284.08 +194.19 +139.16 +260.76 +436.72 +355.36 +.....+250.61}{20}

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Solving (b): The standard deviation

This is calculated as:

\sigma = \sqrt{\frac{\sum(x - \bar x)^2}{n-1}}

\sigma = \sqrt{\frac{(242.87 - 260.1615)^2 +(212.00- 260.1615)^2+(260.93- 260.1615)^2+(284.08- 260.1615)^2+.....+(250.61- 260.1615)^2}{20 - 1}}\sigma = \sqrt{\frac{94938.80}{19}}

\sigma = \sqrt{4996.78}

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Solving (c): 95% confidence interval of standard deviation

We have:

c =0.95

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\alpha = 0.05

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df = 20 -1

df = 19

Determine the critical value at row df = 19 and columns \frac{\alpha}{2} and 1 -\frac{\alpha}{2}

So, we have:

X^2_{0.025} = 32.852 ---- at \frac{\alpha}{2}

X^2_{0.975} = 8.907 --- at 1 -\frac{\alpha}{2}

So, the confidence interval of the standard deviation is:

\sigma * \sqrt{\frac{n - 1}{X^2_{\alpha/2} } to \sigma * \sqrt{\frac{n - 1}{X^2_{1 -\alpha/2} }

70.69 * \sqrt{\frac{20 - 1}{32.852} to 70.69 * \sqrt{\frac{20 - 1}{8.907}

70.69 * \sqrt{\frac{19}{32.852} to 70.69 * \sqrt{\frac{19}{8.907}

53.76 to 103.25

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aleksklad [387]

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