A research is being done to evaluate the prevalence of catheter-associated urinary tract infection (CAUTI) in an urban hospital's critical care unit (ICU). The graph below depicts the number of CAUTI cases among ICU patients in this hospital for the month of July. Which of the following is the number of common cases on July 31 based on the plot?

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Eductional Objective: Unlike period prevalence, point prevalence considers only the number of disease cases that are active at a specific point in time.

A Research Is Being Done to Evaluate the Prevalence of Catheter-Associated