Question

three unbiased coin are tossed simultaneously. then, the probability of receiving at the most two tails is ______.

Answer 1

Answer:

3 coins could land in any of these ways:  

HHH  

HHT  

HTH  

THH  

TTH  

THT  

HTT  

TTT  

Those that have at least 2 heads are shown below:  

HHH, HHT, HTH, THH <= that's 4 of 8 for a 50% or 1/2 probability  

The probability of having at most 2 heads is 7/8, based on these choices:  

HHT, HTH, THH, TTH, THT, HTT, TTT <= That's 7 of 8 or 87.5%

Answer 2

Answer: 1/2

Step-by-step explanation:

P{ two tails} = 4/8 = 1/2

Hope it helps u.