Suppose that Y is unknowns with mu =30, sigma = 8, p = 0.8 and z-score = 2.5 the

Question

Suppose that Y is unknowns with mu =30, sigma = 8, p = 0.8 and z-score = 2.5 then find the actual equivalent raw score for Y? 30 50 24 20 None of these The time to complete an exam is approximately Normal with a mean of 70 minutes and a standard deviation of 10 minutes. Using the 68-95-99.7 rule, what percentage of students will complete the exam in under an hour? 68% 5% 16% 32% None of these If two events have no outcomes in common, then those two events are _____independent conditional mutually exclusive None of these Two events are considered _____if the outcome of one does not influence the outcome of the other? mutually exclusive independent conditional None of these

Explanation / Answer

6) = 30

= 8

Z = (X - ) /

or, 2.5 = (X - 30) / 8

or, X = 2.5 * 8 + 30

or, X = 50 (ans)

7) = 70

= 10

Z = (X - ) /

Z for 1 hour or 60 minutes = (60 - 70) / 10 = -1

P(X < 60) = P(Z < -1) = (100 - 68) / 2 = 16% (ans)

8) The two events are mututally exclusive.

9) The events are considered independent,

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