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3 years ago

Help please. Question is in picture.

Mathematics

2 answers:

Naya [18.7K]3 years ago

4 0

Hi, hope you’re having a good day!

Could you please add the picture?

Thanks, have a good day! ❤️❤️

iVinArrow [24]3 years ago

3 0

The picture is not shown, if you could add it, I would be happy and try and answer as best I can! Have a good day! :)

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Write each fraction as a decimal. Use bar notation if necessary odds only

bija089 [108]

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Step-by-step explanation:

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luda_lava [24]

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An article presents voltage measurements for a sample of 66 industrial networks in Estonia. Assume the rated voltage for these n

kramer

Answer:

We accept the null hypothesis and conclude that voltage for these networks is 232 V.

Step-by-step explanation:

We are given the following in the question:

Population mean, μ = 232 V

Sample mean, $\bar{x}$ = 231.5 V

Sample size, n = 66

Sample standard deviation, s = 2.19 V

Alpha, α = 0.05

First, we design the null and the alternate hypothesis

$H_{0}: \mu = 232\\H_A: \mu \neq 232$

We use Two-tailed t test to perform this hypothesis.

Formula:

$t_{stat} = \displaystyle\frac{\bar{x} - \mu}{\frac{\sigma}{\sqrt{n-1}} }$ Putting all the values, we have

$t_{stat} = \displaystyle\frac{231.5- 232}{\frac{2.19}{\sqrt{66}} } = -1.8548$

Now,

$t_{critical} \text{ at 0.05 level of significance, 9 degree of freedom } = \pm 1.9971$

Since,

$|t_{stat}| > |t_{critical}|$

We accept the null hypothesis and conclude that voltage for these networks is 232 V.

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3 years ago

Help me please I think you have to find the area

abruzzese [7]

Answer:

I got B) ; 54m2

Step-by-step explanation:

the above diagram is a trapezium.

the area is gotten by; 1/2 (a+b)h

a = shortest side.

b = the longer side that is directly opposite to (a).

h = height.

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1/2 by 12 by 9

to get 54

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3 years ago

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Step-by-step explanation:

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