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Probability and Statistics Concepts Flashcards

7 cards from real GRE practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Probability and Statistics Concepts flashcards as text

  1. A spinner has 8 equal sections numbered 1–8. What is the probability of landing on an even number?

    Answer: 1/2

    Four of the eight numbers are even, giving 4/8 = 1/2.

  2. The range of the data set {5, 12, 8, 20, 3} is which value?

    Answer: 17

    Range = maximum − minimum = 20 − 3 = 17.

  3. If P(A) = 0.3, P(B) = 0.4, and the events are mutually exclusive, what is P(A or B)?

    Answer: 0.7

    For mutually exclusive events, P(A or B) = 0.3 + 0.4 = 0.7.

  4. A jar contains 6 green and 4 yellow candies. What is the probability of drawing a yellow candy?

    Answer: 2/5

    There are 4 yellow out of 10 total, giving 4/10 = 2/5.

  5. Which measure of central tendency is most affected by an extreme outlier?

    Answer: Mean

    The mean uses every value, so a large outlier shifts it substantially.

  6. How many three-digit codes can be formed using digits 0–9 if repetition is allowed?

    Answer: 1000

    Each of the three positions has 10 choices, giving 10 × 10 × 10 = 1000.

  7. If the probability of rain is 0.25, what are the odds in favor of rain?

    Answer: 1 to 3

    Odds in favor are P to (1−P), i.e., 0.25 to 0.75, which simplifies to 1 to 3.