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IFoA_CAA_M0 Exam - Topic 10 Question 7 Discussion

X is a random variable with expected value E(X).Identify which of the following isnot a valid method for calculating the variance of X.
D) E( X2) - E(X)
A) E[ X - E(X) ]2
B) The second moment of X minus the square of the first moment of X.
C) E( X2) - [ E(X) ]2

IFoA_CAA_M0 Exam - Topic 10 Question 7 Discussion

Actual exam question for IFoA's IFoA_CAA_M0 exam
Question #: 7
Topic #: 10
[All IFoA_CAA_M0 Questions]

X is a random variable with expected value E(X).

Identify which of the following isnot a valid method for calculating the variance of X.

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Suggested Answer: D

by Lucina at May 08, 2022, 01:14 AM

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Ling
8 months ago
B is a legit method, just saying!
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Osvaldo
9 months ago
Variance = E(X²) - [E(X)]², right?
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Denny
9 months ago
Wait, how is D even an option? Seems off.
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Jennie
9 months ago
Totally agree, D doesn't make sense.
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Germaine
9 months ago
Option D is definitely not valid for variance.
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Trevor
9 months ago
I'm pretty confident that E(X^2) - E(X) is not correct for variance, so I would go with option D as the answer.
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Art
9 months ago
I think the second moment minus the square of the first moment is a standard method for calculating variance, so that should be valid.
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Charolette
9 months ago
I remember that variance is related to the expected value, but I'm not sure if option D is valid.
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Edgar
9 months ago
I practiced a similar question where we had to identify incorrect formulas for variance, and I feel like option A might be tricky too.
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Ronny
9 months ago
I think the key here is to focus on the specific wording of the question - it's asking about a technology that reduces database transaction logs response time. Based on that, I'm leaning towards Adaptive Flash Cache as the most likely answer.
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Peggie
10 months ago
Based on my understanding, the ODI JEE components should be deployed on the Administration Server, as that's the central management point for the WebLogic domain.
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Ashlyn
10 months ago
Ah, this is a good one. I'll need to consider the pros and cons of each option before making a decision.
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