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

135, 71, 69, 80, 158, 152, 161, 96, 122, 118, 87, 85

Question

Susan keeps track of the number of tickets sold for each play presented at the community theater. Within how many standard deviations of the mean do all the values fall?

135, 71, 69, 80, 158, 152, 161, 96, 122, 118, 87, 85

anonymous · Answer

I just want to double check my answer. 
I got 2 for my answer and i want to make sure that i am 100% right.

anonymous · Answer

@amistre64

anonymous · Answer

@phi

anonymous · Answer

@experimentX

anonymous · Answer

can you help me ?

experimentx · Answer

http://www.wolframalpha.com/input/?i=standard+deviation+135%2C+71%2C+69%2C+80%2C+158%2C+152%2C+161%2C+96%2C+122%2C+118%2C+87%2C+85 I am not good with stat http://www.wolframalpha.com/input/?i=mean+135%2C+71%2C+69%2C+80%2C+158%2C+152%2C+161%2C+96%2C+122%2C+118%2C+87%2C+85

anonymous · Answer

neither of those had the correct answer lol

experimentx · Answer

that is not giving the correct answer ... of course it is just SD and mean.

experimentx · Answer

find the max and min of the data. subtract it from the mean and divide by SD. you should get answer.