Question

if a seed is planted it has a 75% chance of growing into a healthy plant. If 7 seeds are planted what is the probability that exactly 4 don't grow

Answer 1

nCr*P^r*q^(n-r)
7C4*. 75^4*. 25^(7-4)
35*. 75⁴*. 25³
35*. 316*. 016
11.06*. 016
. 1769
=. 177