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16 multiple-choice questions on Statistics and Probability, about 11% of the High School Algebra 2 bank. Every one carries a written rationale.
Statistics and Probability is one of 9 chapters in CoStudy's High School Algebra 2 bank, and it holds 16 of the bank's 150 multiple-choice questions — roughly 11% of the total. That proportion is not arbitrary: chapters follow the certifying body's published exam outline, and the number of questions in each is set by that domain's published weight, so the share of your practice time this chapter takes matches the share of the real exam it accounts for.
Studying by chapter is worth doing once you have a diagnostic score. A single overall percentage tells you whether you are close; it does not tell you which domain is dragging. Working a weak chapter in isolation, and re-testing it in isolation, is the fastest way to move a score that has stalled — and it is why the mock exams in CoStudy report by domain rather than as one number.
2 questions drawn from this chapter, with the full rationale shown — the controlling principle behind the right answer, and why each wrong option tempts and fails.
Probability of drawing 2 hearts in a row (without replacement) from a standard deck:
Answer: C — (13/52)(12/51) = 156/2652 ≈ 0.0588 ≈ 1/17
Without replacement: P(A and C) = P(A)·P(B|A). First heart: 13/52. After removing one heart, second: 12/51. Product: 156/2652 = 1/17 ≈ 0.0588. Conditional probability.
Sum of arithmetic series: 2 + 5 + 8 + ... + 29 (10 terms):
Answer: B — 155 (S = n(a₁ + aₙ)/2 = 10(2 + 29)/2 = 10(31)/2 = 155)
Arithmetic series sum: S = n(a₁ + aₙ)/2. n = 10, a₁ = 2, a_n = 29. S = 10(31)/2 = 155. Common difference d = 3; verify n: aₙ = a₁ + (n-1)d → 29 = 2 + 3(n-1) → n = 10 ✓.
These are a sample. The full Statistics and Probability chapter runs 16 items with per-chapter progress tracking, on the web and in the iOS app.
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