Find the indicated probability by using the general addition

Find the indicated probability by using the general addition rule. 43) In one city, 47.3% of adults are female, 10.7% of adults are left-handed, and 4.7% are left-handed females. For an adult selected at random from the city, let F = event the person is female L = event the person is left-handed. Find P(F or L). Round approximations to three decimal places. A) 0.485 B) 0.580 C) 0.533 D) 0.687

Solution

p(F or L)=p(F)+P(L)-P(F and L)

=0.473+0.107-0.047

=0.533

(C)