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 General This forum is for non-technical general discussion which can include both Linux and non-Linux topics. Have fun! 04-24-2022, 02:54 AM #1 WoodrowRoberts LQ Newbie   Registered: Jan 2022 Posts: 2 Rep: Probability theory Friends, I urgently need to solve the problem I received on probability theory. A class is taking a multiple choice test with 10 questions where each question has four possible answers. Assume that the answer to any question is independent of that to any other answer. Robert has forgotten to study for this test, so he simply guesses for each question. What is the probability that Robert guesses exactly 8 of the questions correctly? (Round to four decimal places.) What is the probability that Robert gets an or better? Another way of saying this is, what is the probability that he guesses 8 or more questions correctly? This would be the probability of 8 plus the probability of 9 plus the probability of 10. (Round to four decimal places.) At [removed] I got some answers, but did not fully understand the logic of solving the problem . I will be very grateful for your explanation. 04-24-2022, 03:02 AM   #2
ondoho

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Rep:           Quote:
 Originally Posted by WoodrowRoberts I got some answers
Show us what you got so far, we'll take it from there. 04-24-2022, 08:27 AM #3 grumpyskeptic Member   Registered: Apr 2016 Posts: 432 Rep: The probability of getting all of the questions wrong is 0.75 times 0.75 times 0.75....in short 0.75 to the power of ten. So the probability of getting at least one or more questions correct is 1 minus (0.75 to the power of ten). I am not sure, but the probability of getting exactly eight questions correct could be (0.25 to the power of eight) times (0.75 to the power of two). Don't blame me if you give the wrong answer for your homework. Last edited by grumpyskeptic; 04-24-2022 at 08:29 AM. 04-25-2022, 12:13 AM   #4
Xeratul
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Rep:   Quote:
 Originally Posted by WoodrowRoberts Friends, I urgently need to solve the problem I received on probability theory. A class is taking a multiple choice test with 10 questions where each question has four possible answers. Assume that the answer to any question is independent of that to any other answer. Robert has forgotten to study for this test, so he simply guesses for each question. What is the probability that Robert guesses exactly 8 of the questions correctly? (Round to four decimal places.) What is the probability that Robert gets an or better? Another way of saying this is, what is the probability that he guesses 8 or more questions correctly? This would be the probability of 8 plus the probability of 9 plus the probability of 10. (Round to four decimal places.) At https://plainmath.net/35995/a-class-...ons-where-each I got some answers, but did not fully understand the logic of solving the problem . I will be very grateful for your explanation.
Could it be done with GNUPLOT?

Gnuplot is ultimate tool for maths. R for stats.

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