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Vikentia [17]
3 years ago
8

On a quiz there are four multiple-choice questions worth 3 points each and two true/false questionsworth 1 point each . Each mul

tiple-choice question has five possible choices . If a student randomlyguesses on each question , what is the expected value of the student's score on the test ?
Mathematics
1 answer:
Anastaziya [24]3 years ago
7 0

Answer:

The expected value of the student's score on the test is 3.4.

Step-by-step explanation:

Multiple choice questions:

worth 3 points.

Five possible choices, one of which is correct. So the expected value of the student in each multiple choice question is:

m = 3\frac{1}{5} = 0.6

True/false questions:

worth 1 point.

2 options, one of which is correct, so the expected value for each is:

t = 1\frac{1}{2} = 0.5

What is the expected value of the student's score on the test ?

4 multiple choice, two true-false. So

E = 4m + 2f = 4(0.6) + 2(0.5) = 2.4 + 1 = 3.4

The expected value of the student's score on the test is 3.4.

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<span>Let n = the number of pages not read
Then the number of pages read = n/4 + 3
Since the total number of pages is 193, we have

n + n/4 + 3 = 193
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5 0
3 years ago
The largest county in the state of Texas is 6064 square miles larger than the smallest county in the same state. The size of the
Ann [662]

The smallest county is 129 square miles large.

Step-by-step explanation:

Let,

Smallest county = x

Largest county = y

According to given statement;

The largest county in the state of Texas is 6064 square miles larger than the smallest county in the same state.

y = x+6064     Eqn 1

The size of the largest county is 48 times the size of the smallest county plus one square mile.

y = 48x+1         Eqn 2

As Eqn 1 and Eqn 2 are both equal to y, therefore,

Eqn 1 = Eqn 2

x+6064=48x+1\\6064-1=48x-x\\6063=47x\\47x=6063

Dividing both sides by 47

\frac{47x}{47}=\frac{6063}{47}\\x=129\ square \ miles

The smallest county is 129 square miles large.

Keywords: linear equation, substitution method

Learn more about substitution method at:

  • brainly.com/question/9328925
  • brainly.com/question/9184197

#LearnwithBrainly

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3 years ago
Write 5,256 divided into 52 and show your work
Angelina_Jolie [31]
Set up you question 5256 divided by 56 then write the answer. Finally if you get a remainder put the answer then the remainder
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Answer:

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Step-by-step explanation:

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2 years ago
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Step-by-step explanation:

2002 can be rounded to a compatible number such as 2000.

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