80. Florida State University is offering 14 statistics courses scheduled for its 2013 summer semester. One class has room for 30 students, eight classes have room for 60 students, one class has room for 70 students, and four classes have room for 100 students. a. What is the average class size assuming each class is filled to capacity?
b. Space is available for 980 students. Assume that each class is filled to capacity and choose a statistics student at random. Let the random variable X equal the student’s class size. Define PDF for X.
vs. Find the mean of X.
D. Find the standard deviation of X. mean = ∑x/n = 980/14 = ?
Subtract each of the scores (# in each class) from the mean and square each difference. Find the sum of these squares. Divide that by the number of scores to get the variance.
Standard deviation = square root of the variance
I’ll let you do the math.