Data on the oxide thickness of semicon- ductor wafers are as follows: 425, 431, 416, 419, 421, 436, 418, 410, 431, 433, 423, 426, 410, 435, 436, 428, 411, 426, 409, 437, 422, 428, 413, 416. a. Calculate a point estimate of the mean oxide thickness for all wafers in the population. b. Calculate a point estimate of the standard deviation of oxide thickness for all wafers in the population. c. Calculate the standard error of the point estimate from part (a). d. Calculate a point estimate of the median oxide thickness for all wafers in the population. e. Calculate a point estimate of the proportion of wafers in the population that have oxide thickness of more than 430 angstroms.