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Karolina [17]
3 years ago
5

Will choose brainliest!

Mathematics
2 answers:
stepladder [879]3 years ago
8 0

Lets set up some variables:

  • 1st envelope: e_{1}
  • 2nd envelope: e_{2}
  • 3rd envelope: e_{3}

Now let us set up some equations based of the facts:

  • e_{1} +2=\frac{e_{2} }{2} -- > e_{2}  = 2e_{1} +4
  • 2e_{3} =e_{1} +e_{2}
  • e_{2} > e_{3} > e_{1}

Now we could try some numbers out since there isn't really any other way I could solve this so far...

 but we do know that the sum of e_{1} and e_{2} must be even since they equal 2e_{3}

After you tried it out for a little bit, when e_{1} = 2, then e_{2} = 8, and e_{3}  = 5. These three values meet the criteria and we have our answer.

Hope that helped!

 

Reil [10]3 years ago
3 0
Dude give the guy above me Brain liest or else
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Aleks04 [339]

The probability that at least one of the calculators is defective is : 0.725

<h3>What is probability?</h3>

Probability is the likelihood of an event happening or not.

if there is certainty that the event would happen probability is 1.

Analysis:

probability = required outcome/possible outcome

for 33 good calculators and 12 defective calculators, total calculators = 45

4 calculators were chosen, possible outcome = 45C4 = 148995

Required outcome = 33C3 . 12C1 + 33C2 . 12C2 + 33C1 . 12C3 + 33C0 . 12C4

= 65472 + 34848 + 7260 + 495 = 108075

Probability = 108075/148995 = 0.725

Learn more about Probability: brainly.com/question/25870256

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7 0
2 years ago
Scores on the Critical Reading portion of the SAT college entrance test in a recent year were roughly Normal with mean 496 and s
Sliva [168]

Answer:

C. 115 / square of 100 = 11.5

Step-by-step explanation:

The Central Limit Theorem estabilishes that, for a random variable X, with mean \mu and standard deviation \sigma, the sample means with size n of at least 30 can be approximated to a normal distribution with mean \mu and standard deviation s = \frac{\sigma}{\sqrt{n}}

In this problem, we have that:

\sigma = 115, n = 100. So

s = \frac{115}{\sqrt{100}} = 11.5

So the correct answer is:

C. 115 / square of 100 = 11.5

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Answer:

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Step-by-step explanation:

I think its correct

8 0
2 years ago
Read 2 more answers
Please help i am very confused
DanielleElmas [232]
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Answer:

81

Step-by-step explanation:

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