. A university has 25,000 students, of whom 17,000 are undergraduates. The housing office takes a simple random sample of 500 students; 357 out of the 500 are undergraduates. Fill in the blanks. (If necessary, round using 2 decimal places. For percentages, enter a number between 0 and 1)  (a) For the number of undergraduates in the sample, the observed value is _________ but the expected value is ______________ (b) For the percentage of undergraduates in the sample, the observed value is ____________ but the expected value is ____________

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