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meriva
3 years ago
5

A multiple choice exam has 20 questions. Each question has 3 possible answers; there is no partial credit. Only 1 answer out of

the 3 possible answers is correct; no questions are dependent on getting the correct answer for a previous question. The passing score for the exam is 60% or better. If you randomly guess the answer to each question, what is the probability that you will pass the test? Round your answer to three decimal places and report as a DECIMAL - example: 0.234
Mathematics
1 answer:
amid [387]3 years ago
6 0

Answer:To find out the theoretical probability of the case given, we need to make certain assumptions.

First, we'll assume that he'll attempt all of the questions, i.e he'll attempt all 10 questions.

Next assumption is that each option in each question is equally likely to be marked by the student.

This pretty much leads us to a binomial probability distribution.

Conditions are:

   Answers 10 questions.

   Each question has 4 options with only one correct answer and all other incorrect answers.

   Student is equally likely to pick any outcome in any given question.

   Hence, probability of choosing correct answer is 1/4 = 0.25. Probability of choosing incorrect answer is 1–1/4 = 3/4 = 0.75.

   The number of trials is 10.

   Total number of success is exactly 8 and failure is 2 amongst the 10 questions in any particular order.

Now, calculation is fairly simple.

Binomial probability distribution is such that…

P(8 correct ; 2 wrong)

= 10C8 × (0.25)^8 × (0.75)²

= 405/1048576 ≈ 3.862380981 × 10^-4 ≈ 0.000386

Step-by-step explanation:

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Wewaii [24]
<span>Based on the rules of statistics</span>

 68% of the data falls within 1 standard deviation of the mean

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3 years ago
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4 0
3 years ago
Please help simplify with steps 
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Remember that you can always multiply or divide BOTH the numerator and denominator
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The way to simplify a fraction is to divide both the numerator and denominator by their
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Do you see all of those 'x's on the top and bottom ?  The top and bottom can
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<u>Denominator:</u>
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So, the simplified fraction is [  -4 / (1 - 2x)  ].

That's a perfectly good answer, but you could make it look a little prettier
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Either one is fine.
8 0
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