Question

On a multiple choice test with 17 questions, each question has four possible answers, one of which is correct. For students who guess at all answers, find the mean for the number of correct answers. 

• 4.3 

• 5.7 25) 

• 8.5 

• 12.8

Answer 1

solution:- option: 4.3

explanation:-

there is a one in four chance

=> 25% chance, of getting a particular question which is correct

=> this is the same probability for each of the 17 question

mean = n*p

= 17*0.25

= 4.25

= 4.3