Mrs. Brown gives two tests to her class. 30% of the class passed both tests and 45% of the class passed the first test. What

percent passed the second test given that they passed the first test?

A)

15%

B)

33%

67%

D)

75%

Question

Weston Grant

Mathematics

6 November, 03:31

Mrs. Brown gives two tests to her class. 30% of the class passed both tests and 45% of the class passed the first test. What

percent passed the second test given that they passed the first test?

A)

15%

B)

33%

67%

D)

75%

+2

Answers (1)

Know the Answer?

Mariela Mcfarland · Answer 1

C) 67%

Step-by-step explanation:

Conditional probability:

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

P (passed 2nd given passed 1st) = P (passed 2nd and 1st) / P (passed 1st)

P (passed 2nd given passed 1st) = 0.30 / 0.45

P (passed 2nd given passed 1st) = 0.67

Mrs. Brown gives two tests to her class. 30% of the class passed both tests and 45% of the class passed the first test. Whatpercent passed the second test given that they passed the first test?A)15%B)33%67%D)75%

Mrs. Brown gives two tests to her class. 30% of the class passed both tests and 45% of the class passed the first test. What

percent passed the second test given that they passed the first test?

A)

15%

B)

33%

67%

D)

75%