Consumer Reports posts reviews and ratings of a variety of products on its website. The following is a sample of 20 speaker systems and their ratings. The ratings are on a scale of 1 to 5, with 5 being best.

a. Compute the mean and the median.
b. Compute the first and third quartiles.
c. Compute the standard deviation.
d. The skewness of this data is €“ 1.67. Comment on the shape of the distribution.
e. What are the z-scores associated with Allison One and Omni Audio?
f. Do the data contain any outliers? Explain.

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Infinity Kappa 6.1 Cambridge Ensemble II Dynaudio Contour 13 Hsu Rsch. HRSW12V Legacy Audio Focus Mission 73li Eosone RSF1000 Joseph Audio RM7si Omni Audio SA 12.3 Polk Audio RT12 Sunfire True Subwoofer Yamaha NS-A636 Snell Acoustics D IV