PROPERTIES:  Add these properties to the Person object (or add arrays, if you have no class ;^>):

      wtdiff      // A value equal to the difference between wt and average wt (μwt)
      wtdiff2     // The square of wtdiff 

If  wtavg  is a global variable that contains the mean average of all of the wt properties, then code to set the diff and diff2 values might look something like this:

for (int j=0; j<many; j++) { jones[j].diff= jones[j].wt - wtavg ; jones[j].diff2= sq( jones[j].wtdiff ); }

BUTTONS:  Add the following buttons, and perform the specified actions when the button is clicked.
Make each button a different color, with its name in a contrasting color.

• RESET

    Reinitialize all properties (including colors) to random values.
  Don't forget to recalculate new averages for all properties, then set new values for each wtdiff and wtdiff2 property (diff= wt - wtavg; wtdiff2= sq(wtdiff);) and recalculate new averages for wtdiff and wtdiff2. (The average for wtdiff2 is the "variance" (σ²).
  

• NEXT

    Add one to all ages, and adjust properties as specified in project 8.
     (The ht and wt properties change by a random value, and all averages should be recomputed; then, wtdiff and wtdiff2 must be recalculated for all objects).
  

• Weight Watchers

    Display the skinniest and fattest persons (lowest and highest wt property) at the left and right side, near the bottom of the screen.
  

• "SIGMA" σ

    For all of the "wt" (weight) values, calculate the "standard deviation" (σ) as described below, and display it between the two objects displayed by the "WW" button, above.
  Note that the "standard deviation" (σ) is merely the square-root of the "variance" (σ²), which is the average of the wtdiff2 values, and should already be displayed at the bottom of the wtdiff2 column of the table.

  STATISTICS REVIEW: The "standard-deviation" (σ) is the square-root of the variance (σ²). For the wt property, the variance (σ²) is the mean average of the "wtdiff2" values. Add up all of the values for "wtdiff2", and divide by the number of values (many=10), to get the variance. Note that each wtdiff value is the wt value minus wtavg, and each wtdiff2 value is sq(wtdiff).

  
  

• BIRDS

    When this button is clicked, a flock of birds should fly across the screen, from the left, disappearing when they reach the right side. (No bouncing is necessary.) Use a simple triangle for each bird. The number of birds should be a random number from 3 to 10, and each bird should fly slightly behind and slightly below the one in front of it. (For extra credit, also make each bird slightly smaller than the one it follows.)

GRADING RUBRIC:

AVGS 	Average computed and displayed for each property.
DIFF2	Values (diff, diff2) computed and displayed for each row.
Table	(Display a table of values)
Show	(Display some people)

Buttons	Working buttons
RN	Reset (random values), Next (age++, adjust properties)
WW	Display skinniest & fattest
Sigma	Calculate sigma, display it
Birds	Flock of birds (random number) flies when clicked

Objects	Class definition, consturctors, etc.
Coding	Coding, readability, etc. 



String[] cats= { 
	"AVGS",	  "DIFF",	"Table","Show",	
	"Buttons","R/N",	"WW",  	"Sig",	"Birds",  	
	"Objects","Coding" 
};
int points[]= {
	0,		0,	0,	0,	
	0,  		0,	0,  	0,	0,  	
	0,  		0 
};
void grading() {
  //// Display grading for exam ////
  int x=width/4, y=height-30, total=0;
  fill(0);
  for (int i=0; i0) text( points[i], x, y+15 );
    total += points[i];
    x += 50;
  }
  fill(255,0,0);
  x += 20;
  text( "TOTAL", x, y );
  if (total>0) text( total, x, y+15 );
}
/* ADD:
  draw() {
              grading()
*/