Practice Test GeeksISAT - International Student Admissions Test Practice Test
← All ISAT Flashcard Decks

Probability and Statistical Analysis Flashcards

7 cards from real ISAT 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 Statistical Analysis flashcards as text

  1. In a sample of 200 students, 80 play sports. What is the relative frequency of students who play sports?

    Answer: 40%

    Relative frequency = 80/200 = 0.40 = 40%.

  2. A probability distribution has E(X) = 5 and Var(X) = 4. What is the standard deviation of X?

    Answer: 2

    Standard deviation = √Var(X) = √4 = 2.

  3. Bayes' theorem is used to:

    Answer: Update probability based on new evidence

    Bayes' theorem revises the probability of a hypothesis as additional evidence is incorporated.

  4. A data set: 3, 7, 7, 9, 11. What is the mode?

    Answer: 7

    The mode is 7 because it appears twice, more than any other value in the dataset.

  5. If P(A) = 0.4 and P(A|B) = 0.4, what can be concluded about events A and B?

    Answer: A and B are independent

    Since P(A|B) = P(A), knowing B occurred doesn't change the probability of A, so A and B are independent.

  6. A researcher records heights of 500 students. The distribution is approximately normal with mean 170 cm and SD 8 cm. About how many students are between 162 cm and 178 cm?

    Answer: 340

    162 and 178 are each one SD from the mean; the empirical rule says ~68% of 500 = 340 students fall in this range.

  7. Which of the following is an example of a continuous random variable?

    Answer: The exact temperature at noon

    Temperature can take any value within a range, making it a continuous random variable unlike counts, which are discrete.

How this page was made: written with AI tools and published by Nathan Beja, founder of Practice Test Geeks, who is responsible for its content. Exam facts are checked against the official sources listed below. Not reviewed by a subject-matter expert. Editorial policy

Sources & references

Exam facts on this page (fees, format, dates, passing scores) are checked against these official sources; the date is our last check. Editorial policy

  1. isat.acer.org — Retake policy, score release, score validity, fees, retake fee, test dates, registration, test delivery, eligibility, exam format · verified Oct 2026
Probability and Statistical Analysis Flashcards — ISAT Study Cards with Answers