The New York Times collected data on the number of calories in meals at Chipotle restaurant. The distribution of calories was symmetric and unimodal and a graph of the distribution is shown below. 

a. Use the graph to estimate the mean number of calories in a Chipotle meal.

b. One method for estimating the standard deviation of a symmetric unimodal distribution is to approximate the range and then divide the range by 6. This is because nearly all the data should be within 3 standard deviations of the mean in each direction. Use this method to find an approximation of the standard deviation.

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6% 5% 4% 3% 2%- 1% 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 Calories % of Meals