Practice Test Geeks(NJGPA) New Jersey Graduation Proficiency Assessment Practice Test
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Statistics, Data Analysis, and Probability Flashcards

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

Read the first 7 Statistics, Data Analysis, and Probability flashcards as text

  1. A data set has the values: 4, 7, 7, 9, 13. What is the mean of this data set?

    Answer: 8

    The mean is found by adding all values (4+7+7+9+13=40) and dividing by the count (40÷5=8).

  2. A bag contains 3 red marbles, 5 blue marbles, and 2 green marbles. If one marble is drawn at random, what is the probability it is blue?

    Answer: 1/2

    There are 5 blue marbles out of 10 total (3+5+2=10), so the probability is 5/10 = 1/2.

  3. Which measure of central tendency is most affected by an extreme outlier in a data set?

    Answer: Mean

    The mean uses all values in its calculation, so an extreme outlier pulls it significantly higher or lower.

  4. A scatter plot shows a trend where as x increases, y also increases consistently. What type of correlation does this represent?

    Answer: Positive correlation

    When both variables increase together, the data shows a positive correlation.

  5. The following scores were recorded: 65, 70, 70, 75, 80, 85, 95. What is the median?

    Answer: 75

    When 7 values are listed in order, the median is the 4th value: 65, 70, 70, 75, 80, 85, 95 — so the median is 75.

  6. A student surveys 30 classmates about their favorite subject and displays the data in a bar graph. What type of data did the student collect?

    Answer: Qualitative categorical data

    Favorite subject is a category, not a number, making it qualitative (categorical) data.

  7. A box plot shows a minimum of 20, Q1 of 35, median of 50, Q3 of 65, and a maximum of 80. What is the interquartile range (IQR)?

    Answer: 30

    The IQR is Q3 minus Q1: 65 − 35 = 30.

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