Probabilty help please?

4/20 because there is a total 20 questions and 4 correct answers.

You can simplify this down to get 1/5

If your guesses are totally random, then the probability of getting a right answer for each question would be 1/5. So your chance of getting the wrong answer would be 4/5.

The probability of getting 1 correct would be equal to:

P(at least 1 correct) = 1 - P (getting none correct)

P (getting none correct) = (4/5) ^ 4 (continuous prob. theory)

= 256 / 652

P (at least 1 correct) = 1 - ( 256/ 652 ) = 369 / 652 = 0.5904 or about 59% *corrected*

(copied from windows calculator sry xD )

Prob(at least one correct ) = 1 - Prob(no correct answers) =

1- (4/5)^4 = .5904

(1/5) * 4 = 80% chance of getting one correct

1/5*4/1 = 4/5 or .8 or 80 percent

1/5 or about 26%

i guess

(1/5) x 4 = 4/5 or 0.8

.05%

Idk

idk