SOLUTION: I do know how to do the SD but need to show how its done. could you show me how? thanks #1 Compute the sample mean and Standard Deviation for the data set. 497,193,328,155,326

Question 867289: I do know how to do the SD but need to show how its done. could you show me how? thanks
#1 Compute the sample mean and Standard Deviation for the data set.
497,193,328,155,326,245,270
I did get the mean part and its 2014/7=287.71 is that right?
i did do the SD part kind of and here what i got for 497-287.71=209.29,193-287.71=-94.71,328-287.71=40.29,155-287.71=-132.71,326-287.71=38.29,245-287.71=-42.71 and 270-287.71=-17.71. i added them and did not add to zero. i need help on that.
#2
a) Calculate the median of the data set
480,790,1000+,350,920,860,570,1000+,170,290
b)
Could you accurately calculate the mean for this data set? why or why not?
#3
Calculate the IQR for this data.
140,195,155,115,195,180,110,110,130,50,60
#4
a) Compute the mean for this data.
17=1,18=8,19=2,20=3,21=3,21=1,23=1,25=1,69=1 all adds to 18/20=0.9 right?
b)Compute the median for this data.
c) Which measure of center is best for this data and why?
#5Compute the sample mean and sample standard deviation for this data.
i got the mean its 532/11=48.36. Here are the numbers= 62,23,27,56,52,34,42,40,68,45,83 same thing i did as in #1 but i add it and its not zero.
#6 which of the two groups has the most varability with respect to caffeine per ounce? Explain your choice in words and show all math calculations you did to arrive at your decision.
Top-Selling Energy Drinks= 9.6,10.0,10.0,9.0,10.9,8.9,9.5,9.1
High-Caffeine Energy Drinks= 21.0,25.0,15.0,21.5,35.7,15.0,33.3,11.9,16.3,31.3,30.0
I NEED IT BY NEXT TUESDAY THE 29TH BY 11:59PM. THANK YOU SO MUCH.
Answer by richard1234(7193) (Show Source): You can put this solution on YOUR website!
To find standard deviation, you need the *squares* of the differences of each data point from the mean. Please review how standard deviation is defined. Wikipedia has a few good examples.

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