Struggeling with these statistic problems :(

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

Re: Struggeling with these statistic problems :(

n=10

p=.20

q=1-p

mean=n*p

sd=sqrt(n*p*q)