Susan keeps track of the number of tickets sold for each play presented at The Community Theater. Within how many standard deviations from the mean do all the values fall?

135, 71, 69, 80, 158, 152, 161, 96, 122, 118, 87, 85
A. 3
B. 4
C. 5
D. 2

Question

Susan keeps track of the number of tickets sold for each play presented at The Community Theater. Within how many standard deviations from the mean do all the values fall? 

135, 71, 69, 80, 158, 152, 161, 96, 122, 118, 87, 85
  A. 3 	
  B. 4 	
  C. 5 	
  D. 2

driftracer305 · Answer

u knw wat mean is??

anonymous · Answer

yep I just have trouble getting the standard deviation @driftracer305

driftracer305 · Answer

so the deviation is   take each value and subtract the mean from it and square the result.........

do this for all values and finally find the mean of all the results and sqrt it.... that is std. deviation