 Lv 199 points

# 波莉安娜

• ### A Statistics Problem?

Assume that Y is normally distributed with mean mu and standard

deviation sigma. After observing a value of Y, a mathematician constructs

a rectangle with length L = |Y| and width W = 6|Y|. Let A

denote the area of the resulting rectangle. What is E(A)?

Could you please show me the steps as well? I really want to learn. Thanks.

1 個解答數學5 年前
• ### Statistics Problems?

Suppose that the magnitude of earthquakes striking a region has a

gamma distribution with a = 0.8 and b = 2.4.

(a) What is the mean magnitude of earthquakes striking the region?

(b) What is the probability that the magnitude an earthquake striking

the region will exceed 3.0 on the Richter scale?

(c) What is the probability that an earthquake striking the regions

will fall between 2.0 and 3.0 on the Richter scale?

(d) Compare these answers to question 1. For example, which

probabilities are larger? Explain.

Could you please show me the steps as well? I really want to learn. Thanks.

1 個解答數學5 年前

2 個解答數學5 年前