In Code:

When \\(a \\ne 0\\), there are two solutions to \\(ax^2 + bx + c = 0\\) and they are \\[x = {-b \\pm
\\sqrt{b^2-4ac} \\over 2a}.\\]

Quiz Single/Multiple Choice Example (A, BCD)

1. What is the first option?
  • Option A
  • Option B
  • Option C
  • Option D
#1 Solution: Option A

2. What are the last three options?
#2 Solution: Options B, C, and D


AET Test Quiz

1. A group of drivers are classified into equal number of good drivers
and
bad drivers. For a good driver, the probability of getting into one or more auto accident per year is
0.05.
For a bad driver, the probability of getting into N accidents in a year follows a Poisson distribution
with
mean 3.
  • A. 0.7492
  • B. 0.0498
  • C. 0.0881
  • D. 0.2508
  • E. 0.025
#1 Solution: D. 0.2508

This is a Baye’s Theorem question, which will require us to find the following probabilities

  • Probability of 1 accident and good driver = X
  • Probability of 1 accident and bad driver = Y

And the answer can be derived from \(x \over x + y\)

Since the probability of A and B is the probability of A given B times the probability of B, we have

  • \(Pr(one accident | good driver) Pr(good driver)\) = \((0.05)\)(\(1 \over 2\)) = \(0.025\)
  • \(Pr(one accident | bad driver) Pr(bad driver)\) = (\(3^1 e^3 \over 1!\))(\(1 \over 2\)) =
    \(0.025\)

Finally, the answer is \(0.025 \over 0.025 + 0.074680603\)\(= 0.2505\)