The following are contents of Vitamin C in micro-grams measured from 25 randomly selected Vitamin C chewable tablets produced by Brand A. 346, 372, 351, 354, 362, 390, 386, 396, 391, 370, 365, 372, 362, 348, 391, 369, 367, 398, 366, 379, 385, 397, 374, 350, 383 (a) (2 points) Calculate the sample mean . (b) (2 points) Calculate the sample standard deviation . (c) (2 points) Calculate the sample median value. (d) (3 points) Determine the proportion of the data values that lie within 1.5 and compare the result with the lower bound from Chebyshev's inequality. *For (a) and (b), please round your results to 2 decimal places.