n=10
p=.20
q=1-p
mean=n*p
sd=sqrt(n*p*q)
1.)
A class is given a surprise 10 question multiple choice quiz over material they were supposed to study. Since none of the students are prepared, they are forced to guess the answers. The probability that a guess on any question is right is 20%.
Find the mean number of correct guesses for this 10 question quiz.
2.)
A class is given a surprise 10 question multiple choice quiz over material they were supposed to study. Since none of the students are prepared, they are forced to guess the answers. The probability that a guess on any question is right is 20%.
Find the standard deviation of the number of correct guesses for this 10 question quiz.
- any hints to solve this or way to set the problem up would be very helpful! thanks