Aptitude - Probability - Discussion

Discussion Forum : Probability - General Questions (Q.No. 5)
5.
Three unbiased coins are tossed. What is the probability of getting at most two heads?
3
4
1
4
3
8
7
8
Answer: Option
Explanation:

Here S = {TTT, TTH, THT, HTT, THH, HTH, HHT, HHH}

Let E = event of getting at most two heads.

Then E = {TTT, TTH, THT, HTT, THH, HTH, HHT}.

P(E) = n(E) = 7 .
n(S) 8

Discussion:
121 comments Page 6 of 13.

Praveen kumar said:   9 years ago
You are great, Thanks @Sundar.

Praveen said:   9 years ago
Give the sample space of the given problem.

Sujith Remigius said:   9 years ago
Thank you @Sundar.

Shah Rukh said:   9 years ago
Biased means neither head nor tail.

Unbiased means opposite to biased. i.e It will be in perfect outcomes.

HARINI said:   9 years ago
s = {HHH,HHT,HTH,HTT,THT,TTH,TTT}
S(N) = 8.

LET A = GETTING AT MOST 2 HEADS.
(MAX 2 HEADS;MIN 1HEADS OR 0 HEADS)
A ={HHT,HTT,THH,HTT,THT,TTH,TTT}
N(A) = 7,
P(A) = 7\8.

Siddhi said:   9 years ago
Well explained @Sundar.

A.kalai said:   9 years ago
Can you clear my doubt regarding mean and variance?

Asef rafi said:   9 years ago
What is an unbiased coin?

Zaid said:   9 years ago
Why we taken event 7?

Dhamodar said:   9 years ago
Why include TTT?


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