Forty percent of the students who enroll in a statistics course go to the lab on
a regular basis. Past data indicates that 65% of those students who use the lab
on a regular basis make a grade of A in the course. On the other hand, only 10%
of students who do not go to the lab on a regular basis make a grade of A. If a
particular student made an A, determine the probability that she or he used the
lab on a regular basis.