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NBT Statistics and Probability Flashcards

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

Read the first 6 NBT Statistics and Probability flashcards as text

  1. What is the mean of the following data set: 12, 15, 18, 22, 28?

    Answer: 19

    The mean is the sum divided by the count: (12 + 15 + 18 + 22 + 28) ÷ 5 = 95 ÷ 5 = 19. The mean represents the average value.

  2. A fair die is rolled once. What is the probability of getting a number greater than 4?

    Answer: 1/3

    Numbers greater than 4 on a die are 5 and 6 — that's 2 favourable outcomes out of 6 possible. P = 2/6 = 1/3.

  3. What is the median of: 3, 7, 9, 12, 15, 18, 21?

    Answer: 12

    With 7 values in order, the median is the 4th value (middle). The median is 12. For an odd number of data points, the median is the exact middle value.

  4. If P(A) = 0.4 and P(B) = 0.3, and A and B are independent events, what is P(A and B)?

    Answer: 0.12

    For independent events, P(A and B) = P(A) × P(B) = 0.4 × 0.3 = 0.12. Independence means one event does not affect the probability of the other.

  5. The mode of a data set is:

    Answer: The most frequently occurring value

    The mode is the value that appears most frequently in a data set. A data set can have no mode, one mode (unimodal), or multiple modes (bimodal or multimodal).

  6. In a class of 30 learners, 18 play soccer and 12 play cricket. If 6 play both sports, how many play neither?

    Answer: 6

    Using inclusion-exclusion: those playing at least one sport = 18 + 12 - 6 = 24. Those playing neither = 30 - 24 = 6.