If 3 coins are tossed then what is the probability of at most 3 head
Answers
Answered by
0
At most 3 heads 3 coins = 3 heads or 2 heads or 1 head
Probability of getting head in a coin = 1/2
Hence probability of at most 3 heads is 3/3*(1/2)^3*(1/2)^0 + (3/2)*(1/2)^2*(1/2)^1 + 3/1*(1/2)^1*(1/2)^2
= 0.125 + 0.1875 + 0.375
=0.6875
Lustox:
Sorry, I made a mistake with the formula. It should be
At most 3 heads 3 coins = 3 heads or 2 heads or 1 head
Probability of getting head in a coin = 1/2
Hence probability of 7 heads is 3C3*(1/2)^3*(1/2)^0 + (3C2)*(1/2)^2*(1/2)^1 + 3C1*(1/2)^1*(1/2)^2
= 1*(1/2)^3*(1/2)^0 +3*(1/2)^2*(1/2)^1 + 3*(1/2)^1*(1/2)^2
= 0.125 + 0.375 + 0.375
=0.875
Probability of getting head in a coin = 1/2
Hence probability of 7 heads is 3C3*(1/2)^3*(1/2)^0 + (3C2)*(1/2)^2*(1/2)^1 + 3C1*(1/2)^1*(1/2)^2
= 1*(1/2)^3*(1/2)^0 +3*(1/2)^2*(1/2)^1 + 3*(1/2)^1*(1/2)^2
= 0.125 + 0.375 + 0.375
=0.875
this one is the right answer.... sorry for the mistake
Similar questions