Aptitude | Probability | Question 1

Given a coin which gives HEADS with probability 1/4 and TAILS with 3/4. The coin is tossed k times. What is the probability that we get at least k/2 HEADS is less than or equal to?

(A)

(1/2) ^k/5

(B)

(1/2) ^k/2

(C)

(1/3) ^k/2

(D)

(1/5) ^k/2

Answer: (A)

Explanation:

Source: http://www.cse.iitk.ac.in/users/sbaswana/CS648/Lecture-2-CS648.pptx

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