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Created Dec 3, 2013
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Function to calculate standard deviation.
float computeStandardDeviation(float a[], int n, float mean) {
float variance, deviation, sumsquare = 0;
int i;
for(i=0; i<n; i++) {
deviation = a[i] - mean;
sumsquare += deviation * deviation;
variance = sunsquare/(float)n;
return sqrt(variance);
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