Consider the well failure data in Exercise 2-53. Suppose

Chapter 2, Problem 136E

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QUESTION:

Consider the well failure data in Exercise 2-53. Suppose that two failed wells are selected randomly (without replacement) for a follow-up review.

(a) What is the probability that both are from the gneiss geological formation group?

(b) What is the probability that both are from the same geological formation group?

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QUESTION:

Consider the well failure data in Exercise 2-53. Suppose that two failed wells are selected randomly (without replacement) for a follow-up review.

(a) What is the probability that both are from the gneiss geological formation group?

(b) What is the probability that both are from the same geological formation group?

ANSWER:

Solution

Step 1 of 2

Let A denote the event that the geological formation has more than 1000 wells

Let B be the event that the well be failed

Suppose 2 failed wells are selected randomly without replacement

a) We have to find the probability of both are from genie geological formation group

From the given data the genie geological formation group has 170 wells out of that we are drawing 2 wells

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