A diabetes educator is working with a group of 15 patients who have been newly diagnosed with type 2 diabetes. She administers a brief pretest, reviews carbohydrate counting with them, and then asks them to complete a posttest assessing their knowledge of the total grams of carbohydrate found in one serving of four sample items brought to the class. The results are shown in Table 2-9.

What percentage of the patients answered all four questions correctly?

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Number Correct on the Posttest 0 1 2 3 نیا 4 Number of Patients Who Answered This Number of Questions Correctly (Frequency) 1 1 2 6 5 Number Who Answered This Many or Fewer Questions Correctly (Cumulative Frequency)