SOLUTION: Florida State University has 14 statistics classes scheduled for its Summer 2013 term. One class has space available for 30 students, eight classes have space for 60 students, one

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Question 1027426: Florida State University has 14 statistics classes scheduled for its Summer 2013 term. One class has space available for 30 students, eight classes have space for 60 students, one class has space for 70 students, and four classes have space for 100 students.
Find the standard deviation of X. Please show work.

Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
Let X = number of students in a class
==> E%28X%29+=+mu+=+%281%2A30+%2B+8%2A60+%2B+1%2A70+%2B+4%2A100%29%2F14+=+980%2F14+=+70

==> SD%28X%29+=+sqrt%28Var%28X%29%29+=+sqrt%283000%2F7%29+=+20.7+