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Zielflug [23.3K]
3 years ago
8

Can someone pleaseeee help and if you’re correct i’ll give brainliest

Mathematics
2 answers:
Anestetic [448]3 years ago
7 0

Answer: i can't see the 4th one, what does it say?

Step-by-step explanation:

iogann1982 [59]3 years ago
5 0
What does the last one say?
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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.

4 0
3 years ago
How many liters of 20% alcohol solution must be mixed with 60 liters of a 90% solution to get a 70% solution
Paha777 [63]

Answer:

24 liters of 20% alcohol

Step-by-step explanation:


7 0
3 years ago
5. Use the law of Cosines to find each missing sides. Round to the nearest tenth
stellarik [79]

The measure of angle x will be 88 degrees. Then the correct option is C.

The complete question is attached below.

<h3>What is law of cosine?</h3>

Let there is a triangle ABC such that |AB| = a units, |AC| = b units, and |BC| = c units and the internal angle A is of θ degrees, then we have:

2ab cos θ = a² + b² – c²

The triangle is shown below.

Then the value of the variable x will be

2 · 7 · 10 · cos x = 7² + 10² – 12²

       140 · cos x = 49 + 100 – 144

                cos x = (149 – 144) / 140

                       x = 87.95 ≈ 88°

Then the correct option is C.

Learn more about law of cosines here:

brainly.com/question/17289163

#SPJ1

8 0
2 years ago
You are working at the fun fair and are in charge of buying prizes for your game. You know that the game has a 7/10 chance of wi
Feliz [49]

210. Please mark as brainliest!

5 0
3 years ago
2 plus 3 plus 8 plus 2
xeze [42]

Answer:

15

Step-by-step explanation:

2+3+8+2

2+3=  8+2=

 5  +  10=

     15

     

5 0
3 years ago
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