Answer:
Step-by-step explanation:
If you don't use specific percents of probability of either gender being born written by doctors (boy is like 0.425 or something, I can't remember for sure) and you didn't specify so,
I will say that the probability of a boy being born is 1 out of 2 and a girl being born is 1 out of 2 : thus the percent of either boy or girl being born that time is 0.5 or 50%
1)
the probability that the family will have exactly 3 boys is
P(boy)*P(boy)*P(boy)=1/2*1/2*1/2:
0.5*0.5*0.5=0.125
now, lets convert to percent:
0.125=12.5%
2)
the probability that the family will have exactly 2 boys and 1 girl is:
P(boy)*P(boy)*P(girl)=1/2*1/2*1/2:
0.5*0.5*0.5=0.25*0.5=0.125
now, lets convert to percent:
0.125=12.5%
3)
The probability that the family will have at least 2 girls is:
P(girl)*P(girl)=1/2*1/2:
0.5*0.5=0.25
now, lets convert to percent:
0.25=25%
Does this help? If there are specific decimals on each, then do the same thing only with them
