A group of construction students were asked to find the level of illuminance (unit: lux) in different rooms of a building. Their observations were: 370 500 440 425 400 550 470 440 450 360 410 450 450 460 490 430 530 520 420 400 380 500 330 470 350 460 350 390 440 380 400 410 360 500 460 450 370 480 460 510 a. Calculate the mean, median, standard deviation and skewness of the data. b. Construct a histogram for the data. c. Describe the histogram.

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