The instructor wanted to pass anyone who scored above 69., Ask an Expert

Statistics

Find the probability and the inverse of the following questions.

The following three questions (i.e., questions 1-3) refer to the following information:

Suppose the scores on an exam are normally distributed with mean μ = 75 points, and standard deviation σ = 8 points.

1. The instructor wanted to "pass" anyone who scored above 69. What proportion of exams will have passing scores?

a..25

b..75

c..2266

d..7734

e.-.75

2. What is the exam score for an exam whose z-score is 1.25?

a.65

b.75

c.85

d..8944

e..1056

3. Suppose that the top 4% of the exams will be given an A+. In order to be given an A+, an exam must earn at least what score?

a.61

b.73

c. .516

d.77

e. 89

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Statistics and Probability, Statistics

Category:- Statistics and Probability
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