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Probability and Statistics Flashcards

7 cards from real LLN 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 flashcards as text

  1. You have 3 shirts and 4 pairs of pants. How many different shirt-and-pants outfits can you make?

    Answer: 12

    By the counting principle, 3 x 4 = 12 outfits.

  2. A box of 20 light bulbs contains 2 defective bulbs. What is the probability that a randomly chosen bulb works?

    Answer: 9/10

    18 of the 20 bulbs work, and 18/20 = 9/10.

  3. Commute times in minutes were 12, 15, 15, 18, 20, 22, and 25. What is the median?

    Answer: 18

    With 7 sorted values, the 4th value, 18, is the middle.

  4. Event attendance rose from 200 people to 250 people. What is the percent increase?

    Answer: 25%

    The increase of 50 divided by the original 200 is 0.25, or 25%.

  5. A coin is tossed 50 times and lands heads 28 times. What is the experimental probability of heads?

    Answer: 0.56

    Experimental probability is 28/50 = 0.56.

  6. Which type of graph is best for showing how monthly sales change over a year?

    Answer: Line graph

    Line graphs clearly show trends and changes over time.

  7. One letter is chosen at random from the word NUMBERS. What is the probability it is a vowel?

    Answer: 2/7

    NUMBERS has 7 letters, and 2 of them (U and E) are vowels, so the probability is 2/7.

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Sources & references

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  1. dewr.gov.au — Test delivery, score release, eligibility, passing score, fees · verified Oct 2026