0 votes 0 votes How many times do you need to toss a fair coin to get $100$ heads with probability $90$%? Probability probability gravner engineering-mathematics random-variable + – Pooja Khatri asked Sep 26, 2018 Pooja Khatri 297 views answer comment Share Follow See 1 comment See all 1 1 comment reply Raghav Khajuria commented Sep 26, 2018 reply Follow Share 112 times check it I may be wrong. . 0 votes 0 votes Please log in or register to add a comment.
1 votes 1 votes let number of tosses be N. probability of head=1/2, probability of tail=1/2 using binomial distribution, let X be a random variable. X denotes number of heads $P(X=100)=\binom{N}{100}*0.5^{N-100}*(1-0.5)^{100}$=0.9 aditi19 answered Sep 27, 2018 aditi19 comment Share Follow See all 0 reply Please log in or register to add a comment.