4. | Let A and B be two events such that P( A\B)= 0.4 , P(AUB) = 0.45 and
P(B)=0.75, where B is the complementary event of B.
(a) Find P(An B) and P(A).
(b) Are events A and B independent? Justify your answer.
(10 marks)

We are given:

P(A or B) = 0.75

P(B) = 0.25

P(A / B) = 0.5

We may calculate:

P(A / B) = P(A and B) / P(B)

0.50 = P(A and B) / 0.25

So, P(A and B) = 0.125

the number of the people going.

step-by-step explanation:

the cost to buy one movie ticket is $7. if the total cost for the movie is a function of how many people go, then the input is : the number of the people going.