Example 3

Ms. Scanlon surveys her students about the time they spend studying. She creates a table showing the amount of time students studied and the score each student earned on a recent test. Ms. Scanlon wants to understand the distribution of scores among all the students, and to get a sense of how students are performing and how much students are studying. Find the conditional relative frequencies, expressed as decimals.
  1. Find the total number of students represented in the table by summing the joint frequencies.
  2. Divide each joint frequency by the total number of students.
  3. Represent the conditional joint frequencies in a new table.
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