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Econ 390

Assignment 2

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1.

a.

b.

c.

Table below summarizes the distribution of grades in School X.

What is the Expected Values of the grades?

What is the Variance of the grades?

What is the Standard Deviation of the grades?

Grades

100

95

85

55

5

Probability

0.50

0.10

0.15

0.17

0.08

2. ??~??(1,25) , provide the approximate distribution of y in a graph. (hint: using the 0.95

area fact, we know 95% of the area under the distribution of y must be between ??! ?

1.96 ? ??! and ??! + 1.96 ? ??! . So this can give you the scale of the graph.)

3.

4.

5.

If ??~?? (0,1) then find ??(?? ? 0.45) (from the table)

If ??~?? (0,14) then find ??(?? ? 9)(change B to Z and find the answer from the table)

If ??~?? (2,9) then find ??(?? ? 3.5)(change y to Z and find the answer from the table)

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Explanation & Answer:

2 Problems

Tags:

economics

expected value

applied economics

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