PRMIA Exam 8002 Topic 2 Question 77 Discussion

Actual exam question for PRMIA's 8002 exam

Question #: 77
Topic #: 2

[All 8002 Questions]

For a quadratic equation, which of the following is FALSE?

AIf the discriminant is negative, there are no real solutions

BIf the discriminant is zero, there is only one solution

CIf the discriminant is negative there are two different real solutions

DIf the discriminant is positive there are two different real solutions

Show Suggested Answer

Suggested Answer: D

by Bettina at Apr 23, 2024, 07:46 PM

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Raina

11 months ago

Right, so a = 2 - 2*1 = 0. The correct answer must be D.

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Karma

11 months ago

Using the formula a = mean(Y) - b * mean(X). We have mean(Y) = 2 and mean(X) = 1.

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Harrison

11 months ago

So that rules out choices A and B. Now what about a?

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Raina

11 months ago

Yes, exactly. cov(X, Y) is 10 and var(X) is 5, so b = 10 / 5 = 2.

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Karma

12 months ago

Yeah, it's tricky! So, for b we need cov(X, Y) / var(X), right?

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Raina

12 months ago

I think the question is quite challenging, but I'll try my best.

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Linsey

1 years ago

So, the answer is A) b=0.5, a=2.5.

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Vernell

1 years ago

Yes, and the value of a is 2.5.

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Justine

1 years ago

I think the value of b is 0.5.

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