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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. A data set has mean 50 and standard deviation 5. What percentage of data falls within one standard deviation of the mean (using the empirical rule)?

    Answer: 68%

    The empirical rule states approximately 68% of data falls within one standard deviation of the mean.

  2. What is the probability of two independent events both occurring if P(A) = 0.4 and P(B) = 0.5?

    Answer: 0.20

    For independent events, P(A and B) = P(A) × P(B) = 0.4 × 0.5 = 0.20.

  3. Which value represents the middle 50% of a data set in a box plot?

    Answer: Interquartile range (IQR)

    The IQR is the difference between Q3 and Q1, representing the spread of the middle 50% of data.

  4. A survey of 200 people found 60 prefer brand A. What is the relative frequency of brand A preference?

    Answer: 0.30

    Relative frequency = 60/200 = 0.30.

  5. What is the probability of NOT rolling a 6 on a fair die?

    Answer: 5/6

    P(not 6) = 1 - P(6) = 1 - 1/6 = 5/6.

  6. In a stem-and-leaf plot, which part represents the ones digit?

    Answer: Leaf

    In a stem-and-leaf plot, the leaf represents the last digit (ones), while the stem represents leading digits.