Question 1159717
z-score = {{{(73 - 67)/3}}} = {{{6/3}}} = 2
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Look up 2.00 on a z-table.  The result is 0.9772.  This means there is a 0.9772 probability a student will be shorter than 73 inches.  Since there are 836 students at the school, the expected number of students who would be shorter than 73 inches is:
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836 * 0.9772 = 816.94...or, rounded up to 817 students.