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The probability of getting at least 3 heads in 8 tosses of an unbiased coin is A. 197/256 B.199/256 C.219/256 D.217/256


Akshita  Prava

Akshita Prava

CA Foundation

35

13-Jun-20 09:17

22

Answers (4)

P(x=r) = nCx * Px * (1 â?? P)n â?? x n=8; p=1/2; r=3 r=3x, 4x, 5x, 6x, 7x, 8x When you solve by substituting it we get,c) 219/256


Lavanya Chitturi

Lavanya Chitturi

Moderator

13-Jun-20 16:22

Mam I didn't understand the first step and the third step


Akshita  Prava

Akshita Prava

CA Foundation

35

13-Jun-20 17:05

You have to substitute the n,r,p,q values in the equation of binomial probability given in step 1


Lavanya Chitturi

Lavanya Chitturi

Moderator

15-Jun-20 09:00

I think you understand now

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Prasanth kumar Kamisetty

Prasanth kumar Kamisetty

CA Foundation

11K+

28-Jun-20 14:02

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