boon/src/main/java/org/boon/primitive/Int.java
public static double standardDeviation(Collection<?> inputList, String propertyPath) {
        double variance = variance(inputList, propertyPath);
        return Math.round(Math.sqrt(variance));
    }
public static double standardDeviation(Collection<?> inputList, String propertyPath) {
        double variance = variance(inputList, propertyPath);
        return Math.round(Math.sqrt(variance));
    }
Calculate standard deviation.

@return standard deviation