A fair coin is tossed 11 times. What is the probability of getting exactly 4 heads?
एक fair coin को 11 बार toss किया गया। exactly 4 heads आने की probability क्या है?
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Correct Answer
A. 165 / 1024
ExplanationStep 1: this is a binomial probability with p=1/2. Step 2: probability of exactly 4 heads is C(11,4)(1/2)^11 = 330/2048 = 165/1024. Step 3: tip: for a fair coin, every sequence is equally likely.
Step 1: यह binomial probability है जहाँ p=1/2। Step 2: exactly 4 heads की probability C(11,4)(1/2)^11 = 330/2048 = 165/1024। Step 3: tip: fair coin में हर sequence की probability समान होती है।