RD Sharma - Mathematics (Volume 2)

Book: RD Sharma - Mathematics (Volume 2)

Chapter: 33. Binomial Distribution

Subject: Maths - Class 12th

Q. No. 11 of Very Short Answer

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11

An unbiased coin is tossed 4 times. Find the mean and variance of the number of heads obtained.

Given:


n=4


p(getting atleast one head)=?


• 0 head : HHHH


• 1 head : HTTT


THTT


TTHT


TTTH


• 2 heads :HHTT


HTHT


HTTH


THHT


THTH


TTHH


• 3 heads: HHHT


HHTH


HTHH


THHH


• 4 heads : HHHH


Total outcomes = 16


Outcomes containing at least 1 head = 15


P(getting at least 1 head)=


Chapter Exercises

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