UNC STOR 435: Introduction to Probability
STOR 435 is UNC's calculus-based probability course — combinatorics, random variables, the major distributions, expectation, joint distributions, and the central limit theorem — the mathematical backbone of the STOR majors, actuarial preparation, and the data science track.
Fennie is independent and not affiliated with UNC Chapel Hill. This is an unofficial study guide.
Build my STOR 435 study planWhat makes it hard
It's a problem-solving course wearing a theory course's syllabus: every exam question is a word problem requiring you to model a scenario before any formula applies, and the multivariable calculus prerequisite is consumed for real in joint-distribution integrals. Students who studied statistics by procedure-matching discover probability demands actual modeling judgment.
What you'll cover
- • Counting and combinatorics
- • Conditional probability and independence
- • Discrete and continuous random variables
- • Expectation and variance
- • Joint distributions
- • The law of large numbers and central limit theorem
The STOR 435 study guide
How to study for UNC STOR 435, step by step.
- 1
Take counting seriously in week one
Combinatorics looks elementary and humbles people on exams. Practice permutation and combination setups in volume early — miscounting is the original sin in half of all lost probability points.
- 2
Model first, compute second, every problem
Define the random variables, name the distribution and why it applies, then calculate. Exams grade the modeling step, and students who jump to formulas solve the wrong problem cleanly.
- 3
Learn distributions as scenario templates
Binomial, Poisson, exponential, normal — each encodes a story about when it applies. Build a one-page chart of distribution, story, parameters, and moments, and drill matching scenarios to it.
- 4
Keep the calculus serviced
Joint distributions mean double integrals over described regions, with bounds-finding doing the damage as usual. Refresh MATH 233 integration before that unit arrives.
- 5
Work past problems cold and in volume
Probability intuition is built by being wrong in volume and doing the autopsy. Attempt problems without solutions open, and rework every miss until the modeling error is named.
- 6
Build the judgment on a Fennie Daily Plan
Upload your STOR 435 syllabus and Fennie spaces scenario-modeling practice across the term, refreshes the calculus before joint distributions, and generates word-problem quizzes from your actual materials. Free to start.
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How Fennie helps with STOR 435
Fennie's Daily Plans build STOR 435's modeling judgment the only way it builds — spaced word-problem volume, paced to exams, with calculus refreshed before joint distributions consume it. Chat works the modeling step out loud: which distribution, why it applies, what the random variable is — the step exams actually grade.
FAQ
Is STOR 435 at UNC hard?
It's the quantitative track's first real modeling course: every exam question is a word problem where choosing the setup is the test. The calculus is real too — joint distributions mean genuine double integrals. Students who practice modeling in volume handle it; formula-grabbers don't.
What math do I need for STOR 435?
Multivariable calculus (MATH 233 or equivalent) used honestly: expectation integrals, joint densities, and region-bounded double integrals appear throughout. If your integration is rusty, refresh before enrolling — calculus friction compounds the modeling difficulty.
Is STOR 435 good actuarial exam prep?
It covers most of the probability syllabus for Exam P — distributions, expectation, joint distributions — and is the standard UNC stepping stone for actuarial-track students. Exam P demands speed beyond course exams, so plan additional timed drilling after the course.
Pass STOR 435 with a plan, not a cram
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