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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 coin is flipped 3 times. What is the probability of getting exactly two heads?

    Answer: 3/8

    There are 3 favorable arrangements (HHT, HTH, THH) out of 8 outcomes, giving 3/8.

  2. The standard deviation measures which characteristic of a data set?

    Answer: Spread around the mean

    Standard deviation quantifies how dispersed the values are around the mean.

  3. How many distinct ways can 4 different books be arranged on a shelf?

    Answer: 24

    The number of arrangements is 4! = 24.

  4. If a card is drawn from a standard 52-card deck, what is the probability it is a face card (J, Q, K)?

    Answer: 3/13

    There are 12 face cards out of 52, giving 12/52 = 3/13.

  5. What is the mode of the data set {2, 4, 4, 6, 6, 6, 9}?

    Answer: 6

    The value 6 appears three times, more than any other, so it is the mode.

  6. Two dice are rolled. What is the probability that at least one shows a 6?

    Answer: 11/36

    P(at least one 6) = 1 − (5/6)² = 1 − 25/36 = 11/36.

  7. In how many ways can a committee of 2 be chosen from 5 people?

    Answer: 10

    Order does not matter, so C(5,2) = 10.

Probability and Statistics Concepts Flashcards — GRE Study Cards with Answers