Examine the given run chart or control chart and determine whether the process is within statistical control. 
Definitions:
Warren Buffett
An American investor, business tycoon, philanthropist, and the chairman and CEO of Berkshire Hathaway, known for his successful investment strategies.
Average Tax Rate
The percentage of taxable income that is paid in taxes; taxes paid divided by taxable income.
Stock Market Investor
An individual or entity that allocates capital with the expectation of receiving financial returns in the stock market.
Marginal Tax Rate
The tax rate that applies to the next dollar of taxable income; the percentage of tax applied to your income for each tax bracket in which you qualify.
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