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There are 10 questions on a true-false test. A student feels unprepared for this test and randomly guesses the answer for each of these. (a) What is the probability that the student gets exactly 7 correct? (b) What is the probability that the student gets exactly 8 correct? (c) What is the probability that the student gets exactly 9 correct? (d) What is the probability that the student gets exactly 10 correct? (e) What is the probability that the student gets more than 6 correct?

Sagot :

Answer:

  • Probability getting 7 correct :- 1/10
  • Probability getting 8 correct :- 1/10
  • Probability getting 9 correct :- 1/10
  • Probability getting 10 correct :- 1/10 →
  • Probability getting more than 6 :- 4/10