Archive for January, 2011
Statistics Question: Standard Deviation?
I have this statistics question I can’t seem to get right. It asks to find the standard deviation of a group of data from the chart below:
X, Frequency
44. 3, 24
47. 9, 27
51. 5, 42
55. 1, 45
58. 45, 12
The mean I found is correct (51. 3) but I can’t seem to get the right standard deviation. The sample size (n) is 150
I am using this equation:
Variance = [ Sum of Fx^2 - ((Sum of Fx)^2)/n ] / n-1
What am I doing wrong???
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