A zoo has categorized its visitors into three categories: member, school, and general. The member category refers to visitors who pay an annual fee to support the zoo. Members receive certain benefits such as discounts on merchandise and trips planned by the zoo. The school category includes faculty and students from day care and elementary and secondary schools; these visitors generally receive a discounted rate. The general category includes all other visitors. The zoo has been concerned about a recent drop in attendance. To help better understand attendance and membership, a zoo staff member has collected the following data:

a. Construct a bar chart of total attendance over time. Comment on any trend in the data.
b. Construct a side-by-side bar chart showing attendance by visitor category with year as the variable on the horizontal axis.
c. Comment on what is happening to zoo attendance based on the charts from parts (a) and(b).

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Attendance Visitor Category Genera Member School Total 2009 158,704 104,795 79,876 343,375 2008 153,713 115,523 82,885 2010 163,433 98,437 81,970 343,840 2011 169,106 81,217 81,290 352,121 331,613