Write a Java program to calculate mean and standard deviation of 20 numbers

Vectormike:
Write a Java program to calculate mean and standard deviation of 20 numbers

I even have an assignment on this too

/**
* Method to get the mean of n numbers
* @param numbers - array of numbers
* @return computed mean
*/
public static double getMean(double [] numbers){
double sum = 0;
double mean = 0.0;

//return 0 if there is no number
if(numbers.length < 1)
return 0.0;

//get the sum of the numbers
for(int i = 0; i < numbers.length; i++){
sum = numbers[i] + sum;
}

//calculate the mean
mean = sum/numbers.length;

return mean;
}

/**
* Method to return the standard deviation of n numbers
* @param numbers - a double[] array of numbers
* @return computed standard deviation
*/

public static double getStandardDeviation(double [] numbers){
//Instantiate variables
double sum = 0;
double mean = 0.0;
double variance = 0.0;
double standardDeviation = 0.0;

if(numbers.length < 1)
return 0.0;

//calculate the mean
//return 0 if there is no number
if(numbers.length < 1)
return 0.0;

//get the sum of the numbers
for(int i = 0; i < numbers.length; i++){
sum = numbers[i] + sum;
}

//calculate the mean
mean = sum/numbers.length;

//reset sum to 0;
sum = 0;
//using the computed mean, calculate for the standard deviation
for(int n = 0; n < numbers.length; n++){
double temp = Math.pow(numbers[n] - mean, 2);
sum = temp + sum;
}

//calculate the varianceb
variance = sum/numbers.length;

//calcualte the standard deviation
standardDeviation = Math.sqrt(variance);

return standardDeviation;
}

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I wrote this for school assignment it has GUI where you put any number call me to know where i can share it for you 07032966865

Use this mean calculator to compute the arithmetic mean from a set of numerical values. Data is from: Population Sample Enter comma separated data