Class - boys and girls

In the class are 60% boys and 40% girls. Long hair has 10% boys and 80% girls.

a) What is the probability that a randomly chosen person has long hair?
b) The selected person has long hair. What is the probability that it is a girl?

Correct answer:

p2 =  0.38
p2 =  0.8421

Step-by-step explanation:

B=60%=10060=53=0.6 G=40%=10040=52=0.4 l1=10%=10010=101=0.1 l2=80%=10080=54=0.8  p2=p1=B l1+G l2=0.6 0.1+0.4 0.8=0.38
p2=p1G l2=0.380.4 0.8=0.8421



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