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Ilya [14]
3 years ago
15

PLZ HELP URGENT!!!!!!!

Mathematics
2 answers:
Jobisdone [24]3 years ago
8 0

Answer:

t=1

Step-by-step explanation:

GrogVix [38]3 years ago
5 0

Answer:

t=1

Step-by-step explanation:

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Delvig [45]
The answer is 40

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180-140=40
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3 years ago
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The quality control manager at a computer manufacturing company believes that the mean life of a computer is 120 months, with a
IrinaK [193]

Answer:

P(X<118.81)=0.0803

Step-by-step explanation:

Assuming the distribution for the mean life is approximately normal, with mean 120 months and variance 64 months^2, we can calculate the parameters for a sampling distribution with sample size = 89 computers.

The sampling distribution mean will be equal to the mean for a single computer:

\mu_{89}=\mu=120

The standard deviation will be adjusted by the sample size as:

\sigma_{89}=\sqrt{\sigma^2/n}=\sqrt{64/89}=\sqrt{0.719}=0.848

With these parameters, we can calculate the z-score for X=118.81.

z=\dfrac{X-\mu}{\sigma}=\dfrac{118.81-120}{0.848}=\dfrac{-1.19}{0.848}=-1.403

Then, the probability that the mean of a sample of 89 computers is less than 118.81 months is:

P(X

7 0
3 years ago
What times 3 equal 19? I know it’s a repeating number but what would I put on top?
AlexFokin [52]
You would put a Vinculum on top of it
5 0
3 years ago
Round square root 50 to the nearest hundredth
stiks02 [169]
\sqrt{50} =\sqrt{25\times2} =\sqrt{5^2\times2} =5\sqrt{2} \approx \boxed{\bf{7.07}}
7 0
3 years ago
What is the following product?<br> 4V7•4V7•4V7•4V7<br> A 4(4V7)<br> B 4v7<br> C 7^4<br> D 7
SVETLANKA909090 [29]

Answer:

Option (4)

Step-by-step explanation:

Let x = \sqrt[4]{7}

\sqrt[4]{7}\times \sqrt[4]{7}\times \sqrt[4]{7}\times \sqrt[4]{7} = (x)(x)(x)(x)

                                 = x^{1+1+1+1}

                                 = x⁴

Now we substitute the value x = \sqrt[4]{7}

x⁴ = (\sqrt[4]{7})^4

x⁴ = 7

Therefore, Option (4) will be the answer.

3 0
3 years ago
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