Probability: Formula Sheet

Probability: Formula Sheet

Build a responsible reference sheet of relationships, conditions, units, representations, and decision rules rather than copying unexplained formulas. Studies random variables, distributions, expectation, conditional probability, and stochastic reasoning. Course titles, local sequences, grading, safety rules, required tools, and assessment formats vary; align this resource with the current syllabus and instructor directions.

Learning outcomes

• Explain and apply sample spaces, then connect it to conditional probability using course-appropriate evidence.
• Explain and apply conditional probability, then connect it to discrete random variables using course-appropriate evidence.
• Explain and apply discrete random variables, then connect it to continuous distributions using course-appropriate evidence.
• Explain and apply continuous distributions, then connect it to expectation and variance using course-appropriate evidence.
• Explain and apply expectation and variance, then connect it to sample spaces using course-appropriate evidence.

Prerequisite readiness

algebra, functions, summation, basic calculus for continuous topics, and set notation Use a short ungraded check, repair the smallest missing skill, and immediately retest it in a course-level task.

Reference-sheet entries

• sample spaces: record its governing relationship or decision rule, required conditions, units or evidence, one representation, and a common misuse.
• conditional probability: record its governing relationship or decision rule, required conditions, units or evidence, one representation, and a common misuse.
• discrete random variables: record its governing relationship or decision rule, required conditions, units or evidence, one representation, and a common misuse.
• continuous distributions: record its governing relationship or decision rule, required conditions, units or evidence, one representation, and a common misuse.
• expectation and variance: record its governing relationship or decision rule, required conditions, units or evidence, one representation, and a common misuse.

Use test

Can you choose the right relationship on an unlabeled task and explain why its conditions hold? If not, the sheet is storage rather than understanding.

Reliable method

define the experiment, specify events or variables, choose a rule or distribution, calculate, and test limiting cases Keep assumptions, intermediate reasoning, units, sources, tool use, and checks visible so another learner can follow the decision process.

Representative application

Use Bayes’ rule to update a probability and explain why base rates matter to interpretation. Predict a reasonable result before working, compare the outcome with the prediction, and explain limitations or alternative interpretations.

Error recovery

Watch for confusing mutually exclusive with independent events or ignoring conditioning and base rates. Mark the first unsupported move, classify the cause, correct the reasoning, and schedule a fresh mixed recheck after a delay.

Accessibility, integrity, and safety

Use approved accommodations and accessible formats. Follow course rules for collaboration, citation, calculators, software, generative tools, laboratories, clinical settings, field activity, privacy, copyright, and human or animal subjects. Never use Exams.fit to obtain protected questions or bypass assessment rules.

Evidence to save

When permitted, preserve a probability model with assumptions, derivation, simulation check, and interpretation with the prompt, first attempt, feedback, revision, verification, and reflection. Remove restricted assessment content and private or proprietary information.

Open-learning reference

Compare this original Exams.fit resource with the relevant OpenStax collection and MIT OpenCourseWare when they match the local course. Reviewed August 2, 2026. This page does not replace the current syllabus, instructor, institution, or qualified professional.