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2 years ago

Pls help! 4+1 1/2 ASAP!!!!!!!!

Mathematics

2 answers:

Liula [17]2 years ago

6 0

Answer:

5 1/2

Step-by-step explanation:

When dealing with fractions, add the integers and fractions separately. After you add them, simplify to get your answer.

sukhopar [10]2 years ago

4 0

Answer: 5 1/2

Step-by-step explanation:

Just add the whole numbers you dont need to add with the actual fraction part

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Find the area of a circle with radius, r = 76cm. Give your answer rounded to 3 SF.

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Answer:

17,700.00

Step-by-step explanation:

Area of a circle = 22

------ r2

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------ 76x76 =123,750

7 ---------- =1,768.571

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2 years ago

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

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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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