Question 456624

Find the probability when no girl and when 1 girl , add them and subtract by 1.


probability when no girl =  7C0 * (1/2)^0 *(1/2)^7 =  0.0078

probability when one girl =  7C1 * (1/2)^1 *(1/2)^6 =  0.0546


probability when at least 2 girls = 1 - ( 0.0078 + 0.0546 )

= 0.93751 (approx)