Question

what is the probability of getting 4 or less heads when 5 couns are tossed?

1) 0.3769

2) 0.9687

3) 0.1562

4) 0.0625

Answer 1

probability for getting 4 or less heads = P(x<=4)

total number of toss =n=5

probability for getting head in a toss, p= 1/2

P(x<=4) = 1 - (P(5))

P(5) = getting 5 heads in 5 toss

P(5)=0.03125

P(x<=4) = 1 - (P(5))

P(x<=4) = 1 - 0.03125

P(x<=4) = 0.96875

the probability of getting 4 or less heads when 5 coins are tossed is 0.9687

Option - 2