Igcse Model Questions Vol1 2020 Mathematics Question 8
Practice objective / multiple choice question 8 from the 2020 Igcse Model Questions Vol1 Mathematics examination.
A student attempts a 10‑question multiple‑choice test, each question having four options with only one correct answer. For each question the student either knows the answer (probability 0.6) and answers correctly, or does not know it (probability 0.4) and then guesses, giving a 0.25 chance of being correct. Let \(Y\) be the total number of correct answers. (a) What is the probability that \(Y = 5\)? Give your answer to three decimal places. (b) Find the expected value and the standard deviation of \(Y\), giving the standard deviation to two decimal places.
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About This Question
This is Igcse Model Questions Vol1 2020 Mathematics Question 8. It is one of the objective questions from the 2020 Igcse Model Questions Vol1 Mathematics examination.
Difficulty level: Hard .
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