int i=0,j=0;
    double sum=0;
    double max = Integer.MIN_VALUE;
    
    while(j < nums.length)
    {
        
        sum+=nums[j];
        
        if(j-i+1<k)
        {
            j++;
        }
        
        else if(j-i+1==k)
        {
            
           double avg = sum/k;
            
           max = Math.max(max,avg);
            
            sum-=nums[i];
            
            i++;
            j++;
             
        }

    }
    
    return max;