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: 2.71 2.56 2.64 3.91 2.24 2.84 4.00 4.20 3.80 4.35 3.40 4.50 2.49 3.73 2.83 3.55 2.91 LAUSE SALT (a) Calculate Ex, and Ex2. Ex₁ = mm² Ex₁² = [ mm 4 (b) Use the values calculated in part (a) to compute the sample variances and then the sample standard deviation s. (Round your answers to four decimal places.) s² = S= mm4 mm²

Draw a normal curve representation for the area…then find the numerical value of the area under the normal curve.a) below the meanb) to the left of z = -2.17c) greater than z = 1.28d) between 2.16 and 2.49 standard deviations above the mean

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Determine the area under the standard normal curve that lies to the left of.. a) Z= 0.53 b) Z= -1.19  c) Z= 1.65 d) Z= -0.68

Find the z score such that the area under the standard normal curve to the right is 0.44

Assume for a moment that the distribution of weight of adult is approximately normal with a mean of 179.8 lb and a standard deviation of 93.0 lb find the probably that a randomly selected adult would have a weight at most 272.8 lb A) 0.9413 B) 0.2583 C) 0.8413 D) 0.1583