Probability & Statistics Flashcards
6 cards from real CAA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Probability & Statistics flashcards as text
What is the probability of rolling a sum of 7 with two six-sided dice?
Answer: 1/6
There are six possible outcomes that result in a sum of 7 out of 36 total outcomes, giving a probability of 6/36 = 1/6.
What does the expected value of a probability distribution represent?
Answer: The long-term average outcome
The expected value represents the long-term average outcome of a random variable if the experiment is repeated many times.
If a fair coin is flipped twice, what is the probability of getting two heads?
Answer: 1/4
Each flip has a probability of 1/2 for heads. The probability of two heads is (1/2) × (1/2) = 1/4.
Which measure of central tendency is most affected by extreme values?
Answer: Mean
The mean is most affected by extreme values because it considers all values in a dataset, including outliers.
What does a standard deviation measure in a dataset?
Answer: The spread of values around the mean
The standard deviation measures the spread of data values from the mean, indicating variability within the dataset.
In a normal distribution, what percentage of data falls within one standard deviation of the mean?
Answer: 68%
In a normal distribution, approximately 68% of the data falls within one standard deviation of the mean.