SOLUTION: A quiz has 10 questions, each of them has 5 possible answers. Only 1 answer from 5 is true Please find probability to get: ~ 3 correct answers ~ 5 and 7 correct answers. ~ 5 or

Algebra ->  Probability-and-statistics -> SOLUTION: A quiz has 10 questions, each of them has 5 possible answers. Only 1 answer from 5 is true Please find probability to get: ~ 3 correct answers ~ 5 and 7 correct answers. ~ 5 or      Log On


   

Question 1077530: A quiz has 10 questions, each of them has 5 possible answers. Only 1 answer from 5 is true
Please find probability to get:
~ 3 correct answers
~ 5 and 7 correct answers.
~ 5 or 7 correct answers.
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
Assume this is guessing
10C3(.2)^3(.8)^7=0.2013
5,6,7:
10C5(.2)^5*(.8^5)=0.0264
10C6(.2^6)*(.8^4)=0.0055
7: will be 0.0008
5 or 7 will be 0.0272