Giving a test to a group of students, the grades and gender are summarized below a b c total male 2 19 7 28 female 4 9 14 27 total 6 28 21 55 if one student is chosen at random, find the probability that the student was female or got a(n) "b". ( enter a reduced fraction.)

46/55

Step-by-step explanation:

A B C Total

Male. 2 19 7 28

Female. 4 9 14 27

Total. 6 28 21 55

Total number of students = 55

Pr of picking a female = number of females / total number

= 27/55

There are 27 females and 28 people got a B

Number of females or those who got a B = 27 + 28 = 55

Subtract off 9 females who got B to help correct for double counting . We have 55 - 9 = 46

This means there are 46 people who either got a B, are females or are females who got a B

Pr(female or got a B) = number who are females or got a B / total number

= 46/55

So basically you use the ratio they have given you. You either multiply by 2 if image is enlarged or divide by 2 if it is reduced. (Keep in mind I got the 2 from your ratio : 1inch : 2inches) Therefore the find the original width, you multiply 10 by 2, giving you 20 inches.