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Statistics and Probability Flashcards

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

Read the first 6 Statistics and Probability flashcards as text

  1. What is the mean of the data set: 4, 7, 10, 13, 16?

    Answer: 10

    Mean = (4 + 7 + 10 + 13 + 16) ÷ 5 = 50 ÷ 5 = 10.

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

    Answer: 10.5

    With 6 values, the median is the average of the 3rd and 4th: (9 + 12)/2 = 10.5.

  3. A bag has 3 red, 5 blue, and 2 green marbles. What is the probability of picking a blue marble?

    Answer: 1/2

    P(blue) = 5/10 = 1/2.

  4. What is the mode of: 2, 4, 4, 6, 7, 9, 9, 9?

    Answer: 9

    9 appears three times, more than any other value, making it the mode.

  5. Two fair coins are tossed. What is the probability of getting exactly one head?

    Answer: 1/2

    Outcomes with exactly one head: HT, TH — that's 2 out of 4 total outcomes = 1/2.

  6. What measure of central tendency is most affected by outliers?

    Answer: Mean

    The mean uses every value in its calculation, so extreme outliers pull it significantly up or down.