Java Utililty Methods List Mean

double sum = 0;
for (Double number : list) {
    sum += number;
return sum / list.size();

double mean = 0;
for (Number pd : data) {
    mean += pd.doubleValue() / data.size();
return mean;

if (nums == null || nums.size() == 0 || start < 0 || start >= nums.size() || size <= 0
        || start + size > nums.size()) {
    throw new IllegalArgumentException();
double mean = 0;
for (int i = start; i < start + size; i++) {
    mean += nums.get(i).doubleValue();
return (mean / size);

double val = 0;
for (int i = 0; i < data.size(); ++i)
    val += data.get(i);
return val / data.size();

double sum = 0; 
if (list == null) {
    list = Collections.emptyList();
for (Double i : list) {
    sum += i;
return sum / list.size();
...

if (list == null || list.size() == 0) {
    return 0;
} else {
    double sum = 0;
    int num = 0;
    for (Double d : list) {
        if (d != null) {
            sum += d;
...

return sum(vals) / vals.size();

double sum = 0;
for (Double val : values) {
    sum += val;
return sum / values.size();

double sum = 0.0;
int cnt = 0;
if (values.size() == 0)
    return 0.0;
for (Double value : values) {
    sum += value;
    cnt++;
return sum / cnt;

float mean = 0;
for (float value : values) {
    mean += value;
mean = mean / (float) values.size();
return mean;