VIEWPOINT INDUSTRIES HAS FORECASTED A RATE OF RETURN OF: 20.00 PERCENT IF THE ECONOMY BOOMS (25.00 PERCENT PROBABILITY) 15.00 PERCENT IF THE ECONOMY IS IN A GROWTH PHASE (45.00 PERCENT PROBABILITY) 2.50 PERCENT IF THE ECONOMY IS IN DECLINE (20.00 PERCENT PROBABILITY) -15.00 PERCENT IF THE ECONOMY IS IN A DEPRESSION (10.00 PERCENT PROBABILITY). WHAT IS VIEWPOINT'S STANDARD DEVIATION OF RETURNS? DO NOT ROUND INTERMEDIATE COMPUTATIONS. ROUND YOUR FINAL ANSWER TO TWO DECIMAL POINTS.