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 (mmzj from human optic nerve heads: 2.73 2.65 2.72 3.?8 2.33 2.69 4.02 4.29 3.80 4.24 3.50 4.50 2.47 3.68 2.80 3.57II 3.00 IE USE SALT (a) Calculate Exi and Exlz. 2x.=:mm2 WSW (b) Use the values calculated in part (a) to compute the sample variance 5 52 = E M4 E m 2 and then the sample standard deviaon 5. (Round your answers to four decimal places.)