Z score

import java.util.*;
public class Z{
public double mew(int[] c){
double n=0;
for(int i=0;i<c.length;i++){
n+=c[i];
}
return (n/c.length);
}
public double valu(int[] c){
double k=0;
for(int i=0;i<c.length;i++){
k+=Math.pow((c[i]-mew(c)),2);
}
return Math.sqrt((k/(c.length-1)));
}
public double zs(int[] c,int n){
return ((c[n-1]-mew(c))/valu(c));
}
public static void main(String[] a){
Scanner s=new Scanner(System.in);
int[] c={80,99,40,30,98,48,55,88,66,63,11,20,30,70,50,90,32,33,65,69,89,90,70};
int n;
System.out.println("enter the number");
n=s.nextInt();
Z b=new Z();
System.out.println("Z= "+b.zs(c,n));

}
}