Giving a test to a group of students, the grades and gender are summarized below A B C Total Male 15 12 18 45 Female 4 19 16 39 Total 19 31 34 84 If one student is chosen at random, Find the probability that the student was female OR got an "C".

Step-by-step explanation:

 A B C Total

Male 15 12 18 45

Female 4 19 16 39

Total 19 31 34 84

The probability that the student was Female  OR have got an "C" is

There are overall 39 females and 34 people who got a C.  

So there are (39 +34) overall 73 total people who either they are Female or got a C. We need to reduce off the 16 Females who got C's.

result is  73-16 = 57 people who got a C, they are female, or they are Females who got a C grade.

Total students are 84.

so, divide the 57 over 84.

answer = 0.67

or 57/84

11.81

Step-by-step explanation:

5 1/4 per 20 min (1/3 of an hour)

5.25 (5 1/4) * 3 = 15.75 pounds per hour

$0.75 earned per pound

So, 15.75 * $0.75 = $11.81