A histogram of total US monthly retail sales, in billions of dollars, for the 136 months starting with January 2000 is shown in the figure below. Is the distribution approximately symmetric and bell-shaped? Use the histogram to give a rough estimate of the mean and standard deviation of monthly US retail sales totals. 200 250 300 350 400 Monthly Retail Sales Mean 2 i 300 billion dollars. Standard deviation = i billion dollars. Frequency 0 5 10 15 20 25

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