For the experiment of tossing a coin three times, how do you find the probability of getting at least two heads?

2 Answers
Aug 22, 2017

Answer:

#1/2#

Explanation:

Since we only have three throws it will be easier to list all possibilities, of 1st, 2nd and 3rd throws

#H =# head

#T= #Tail

#color(blue)(HHH)#

#color(blue)(HHT)#
#color(blue)(HTH)#
#color(blue)(THH)#

# T T H #
#THT#
#H T T#

#T T T#

Eight possibilities in all, and the requirement of at least two heads is shown in blue

#X=" number of heads"#

#P(X >=2)=4/8=1/2#

Aug 22, 2017

Answer:

1/2

Explanation:

total possible case :- HHH, HHT, HTH, THH, TTT, TTH, THT, HTT

At least two heads :- 4

so the probability of getting at least two head is 4/8 = 1/2