A study of the relationship between age and various visual functions (such as acuity and depth perception) reported the following observations on the area of scleral lamina (mm²) from human optic nerve heads: 2.74 2.57 2.80 3.75 2.37 2.75 3.88 4.16 3.87 4.32 3.43 4.57 2.46 3.67 2.70 3.63 3.11 ЛUSE SALT (a) Calculate Σx; and Σx;². Ex = Σχ = mm² mm4 (b) Use the values calculated in part (a) to compute the sample variance s² and then the sample standard deviation s. (Round your answers to four decimal places.) s² = S = mm 4 mm²

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