Question

giving a test to a group of students, the grades and gender are summarized below grades and gender a b c total male 10 17 6 33 female 11 15 13 39 total 21 32 19 72 if one student is chosen at random, find the probability that the student did not get an \a\ probability = (round to 4 decimal places)

Explanation:

Step1: Find number of students who got A

The number of students who got an A is 21 (from the total - A column).

Step2: Find number of students who did not get A

The total number of students is 72. So the number of students who did not get A is $72 - 21=51$.

Step3: Calculate the probability

The probability $P$ that a student did not get an A is the number of students who did not get A divided by the total number of students. So $P=\frac{51}{72}\approx0.7083$.

Answer:

0.7083