In the class of 2010 25 of students taking the Mathematics p

In the class of 2010, 25% of students taking the Mathematics portion of the SAT (Scholastic Aptitude Test) scored over a 600. If we take random samples of 100 members of the class of 2010 and compute the proportion who got over a 600 on the Math SAT for each sample, what will be the mean and standard deviation of the distribution of sample proportions?

mean = 0.25*100 = 25

sd = sqrt(100*0.25*0.75) = 4.3301