The plasma beta-carotene level (concentration of beta-carotene in the blood), in ng/ml, was measured for a sample of n = 315 individuals, and the results are shown in the histogram inFigure 2.15.

(a) Describe the shape of this distribution. Is it symmetric or skewed? Are there any obvious outliers?
(b) Estimate the median of this sample.
(c) Estimate the mean of this sample

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100 50 200 400 600 800 1000 1200 1400 1600 Plasma Beta-Carotene Frequency