S
00XP

Exam tomorrow — your weak spots first

Chapters 1–2. Tap a trouble spot for its rule card, worked examples and practice, or follow the path below.

  1. 1Permutation or combination?Swap test: does swapping two picks make a new outcome? Then multiply within a case and add across cases; divide by r₁! r₂! for repeats.
  2. 2Quartiles & outlier limitsLeave the median OUT of both halves when n is odd, then fences = Q1 − 1.5·IQR and Q3 + 1.5·IQR.
  3. 3"And" vs "given" in a table"AND" = one cell ÷ grand total; "GIVEN A" = that cell ÷ A's total only.
  4. 4Subtract the overlapNot mutually exclusive → subtract the overlap exactly once.
  5. 5binomcdf lower / upperTurn the words into lower/upper first: at least k → k to n, more than k → k + 1 to n, less than k → 0 to k − 1.
30-question practice exam Answer-key errors to know

Study path

  1. Prereq · Unit 0Arithmetic survival kit
  2. 1.1 · Unit 1Frequency distributions
  3. 1.2 · Unit 2Histograms, polygons, ogives
  4. 1.3 · Unit 3Pie graphs, dot plots, stem-and-leaf
  5. 1.4 · Unit 4Five-number summary & box plotsWeak spot
  6. 2.1 · Unit 5Sample spaces & probabilityWeak spot
  7. 2.2 · Unit 6Addition rulesWeak spot
  8. 2.3 · Unit 7Multiplication rules & conditional probabilityWeak spot
  9. 2.4 · Unit 8Counting rules & factorials
  10. 2.5 · Unit 9 · doublePermutations vs combinationsWeak spot
  11. 2.6 · Unit 10Probability with combinations
  12. 2.7 · Unit 11Expected value
  13. 2.8 · Unit 12Binomial distributionWeak spot
  14. Exam · Unit 13Practice exam (30 questions)