28% of students at a university bought lunch from the cafeteria on class days. On a recent class day, 486 students from this university were sampled and 149 of these had bought lunch from the school cafeteria. Use the appropriate formula to determine the test statistics (z-score) that can be used in a hypothesis test. (Do not preform the hypothesis test. No significance level is given, since you are NOT asked to do a complete test.)

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