📢 Too many exams? Don’t know which one suits you best? Book Your Free Expert 👉 call Now!


    âš¡ Azaadi sale - Celebrate Independence Day with Flat 55% Off On all courses! 13 to 17 Aug âš¡ Enroll Now

    Question

    An unbiased coin is tossed until a head appears. The

    expected number of tosses required is
    A 1 Correct Answer Incorrect Answer
    B 2 Correct Answer Incorrect Answer
    C 4 Correct Answer Incorrect Answer
    D ∞ Correct Answer Incorrect Answer

    Solution

    Let X denote the number of tails tossed before the head appears. Then X is a geometric random variable. P(head) = 1 / 2 and the expectation is E(X)=1 / (1/2) = 2.

    Practice Next
    ask-question

    Not sure which exam is best for you Talk to our expert

    Get My Free Call