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Data Interpretation & Statistics Flashcards

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

Read the first 7 Data Interpretation & Statistics flashcards as text

  1. A class of 20 students has an average test score of 80. If one student scoring 100 leaves, what is the new average?

    Answer: About 78.9

    Total drops to 1600 − 100 = 1500 over 19 students, about 78.9.

  2. Which value divides an ordered data set into two equal halves?

    Answer: Median

    By definition the median splits the data into two equal halves.

  3. A table shows 15% of 200 survey responses were 'yes'. How many said 'yes'?

    Answer: 30

    15% of 200 is 0.15 × 200 = 30.

  4. On a histogram, the bars represent what?

    Answer: Frequencies of value ranges

    Histogram bars show how many data points fall in each interval.

  5. The data set 10, 10, 10, 10 has what standard deviation?

    Answer: 0

    Identical values have no spread, so the standard deviation is 0.

  6. If the probability of an event is 0.25, what is the probability it does NOT occur?

    Answer: 0.75

    Complement equals 1 − 0.25 = 0.75.

  7. A line graph shows temperature peaking at noon then falling. What is the highest point called?

    Answer: Maximum

    The highest value on the graph is the maximum.