σ = √[ (82-85.48)² + (83-85.48)² + (86-85.48)² + (87-85.48)² + (88-85.48)² + (88-85.48)² + (89-85.48)² + (92-85.48)² + (90-85.48)² + (89-85.48)² + (86-85.48)² + (85-85.48)² + (90-85.48)² + (80-85.48)² + (91-85.48)² + (80-85.48)² + (88-85.48)² + (80-85.48)² + (81-85.48)² + (84-85.48)² + (87-85.48)² + (85-85.48)² + (82-85.48)² + (85-85.48)² + (88-85.48)² + (88-85.48)² + (81-85.48)² + (86-85.48)² + (88-85.48)² + (84-85.48)² + (85-85.48)² + (84-85.48)² + (89-85.48)² + (81-85.48)² + (93-85.48)² + (91-85.48)² + (89-85.48)² + (85-85.48)² + (84-85.48)² + (87-85.48)² + (85-85.48)² + (80-85.48)² + (81-85.48)² + (83-85.48)² + (85-85.48)² + (80-85.48)² + (82-85.48)² + (85-85.48)² + (84-85.48)² + (88-85.48)² ] / 50
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