Question 1192953
exactly 10 will return is 0.3^10=0.0000059 or 5.9 x 10^(-6)
-
5 families is 10C5*0.3^5*0.7^5=252*0.3^5*0.7^5=0.1029
-
4 families is 10C4=210*0.3^4*0.7^6=0.2001
-
3 families is 10C3=120*0.3^3*0.7^7=0.2668
Total of those three is 0.5698.