A survey of business statistics students indicated that students who have spent time studying review problems have a probability of 0.90 of getting a B or better grade. Students who do not review have a probability of 0.60 getting a B or better grade. It is believed that only half of the students do review problems. (Use: Event B = “get a B or better”;Event R = “do review problems”)
Find P(B), the probability of getting a B or better grade.

Question

A survey of business statistics	students indicated that	 students who have spent time studying review problems have a probability of 0.90 of	getting	a B or better grade. Students who do	not review have a probability	of 0.60 getting	a B or better grade. It is  believed	that only half of the students do review problems. (Use: Event	B = “get a B or better”;Event R = “do review problems”)
Find	P(B),	the	probability of getting a B or	better grade.