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zscorespractice - Let X = number of days 8 What proportion...

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POLS 4150 – Practice problems for calculating areas under the normal curve In a large class, the average final exam score was 75 with a standard deviation of 8. Assume that the scores are distributed normally. Let X = exam score 1) What proportion of students scored above a 65? 2) What proportion of students scored between an 81 and an 89? 3) What proportion of students scored below a 61? 4) What proportion of students scored between a 61 and an 85? 5) What proportion of students scored above a 91? 6) What proportion of students scored between 55 and 65? 7) What proportion of students scored below an 89?
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The average time it takes a large University to reimburse faculty members for travel is 36 days with a standard deviation of 5 days.
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Unformatted text preview: Let X = number of days. 8) What proportion of faculty members receive reimbursement between 38 and 42 days? 9) What proportion of faculty are reimbursed within 30 days? (30 days or less?) 10) What proportion of the faculty are reimbursed within 40 days? (40 days or less) 11) What proportion of the faculty have to wait at least 30 days before being reimbursed? (30 days or more) 12) What proportion of the faculty have to wait at least 40 days before being reimbursed? (40 days or more) 13) What proportion of faculty members receive reimbursement between 28 and 34 days? 14) What proportion of faculty members receive reimbursement between 30 and 40 days?...
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