A study is conducted to estimate the prevalence of catheter-associated urinary tract infection (CAUTI) in the intensive care unit (ICU) of an urban hospital. The plot below shows the number of cases of CAUTI in this hospital during the month of July among patients in the ICU. Based on the plot, which of the following is the number of prevalent cases on July 31? 
Definitions:
Bottle of Pop
A colloquial term referring to a sealed container filled with a carbonated soft drink.
Installment Plan
A payment method allowing a purchaser to pay for goods or services over a period of time in regular, fixed amounts.
Finance Company
A company that makes loans to individuals and/or businesses.
Breach of Agreement
The failure to fulfill the terms of a contract by one or more parties involved.
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