Random Variables Interview Questions
Working fluently with distributions, expectation, and variance separates strong candidates. These questions cover discrete and continuous random variables and their key properties.
53 random variables questions · 17 free to practise now.
- Binomial momentsEasyRandom VariablesStatisticsView →
- CDF of a maximum of uniformsEasyRandom VariablesStatisticsView →
- Maximum of three uniformsEasyProbabilityRandom VariablesView →
- Mean of an exponentialEasyRandom VariablesExpected ValueView →
- Normalizing a linear densityEasyRandom VariablesCalculusView →
- Precision of the sample meanEasyRandom VariablesStatisticsView →
- Probability of hitting an exact valueEasyProbabilityRandom VariablesView →
- Reading a z-scoreEasyRandom VariablesStatisticsView →
- Summing normalsEasyRandom VariablesStatisticsView →
- The memoryless propertyEasyProbabilityRandom VariablesView →
- Variance of a dice sumEasyRandom VariablesStatisticsView →
- Variance of a linear combinationEasyRandom VariablesStatisticsView →
- Variance of a uniformEasyRandom VariablesStatisticsView →
- Variance of an indicatorEasyRandom VariablesStatisticsView →
- All six faces (coupon collector)MediumRandom VariablesExpected ValueView →
- Expected maximum of two diceMediumRandom VariablesExpected ValueView →
- Variance of a dieMediumRandom VariablesStatisticsView →
- At least two sixes in five rollsMediumProbabilityRandom Variables Premium
- Best linear blend of two estimatesMediumRandom VariablesStatistics Premium
- Correlation of overlapping sumsMediumRandom VariablesStatistics Premium
- Covariance of sum and differenceMediumRandom VariablesStatistics Premium
- Density of a sum of two uniformsMediumProbabilityRandom Variables Premium
- Density of a uniform squaredMediumRandom VariablesCalculus Premium
- Expectation as a sum of tailsMediumRandom VariablesExpected Value Premium
- Expectation of e raised to a normalMediumRandom VariablesExpected Value Premium
- Fourth moment of a normalMediumProbabilityRandom Variables Premium
- MGF of an exponentialMediumRandom VariablesCalculus Premium
- Mean of a lognormalMediumRandom VariablesFinance & Derivatives Premium
- Median of an exponentialMediumRandom VariablesStatistics Premium
- Memoryless waitingMediumConditional Probability & ExpectationRandom Variables Premium
- Minimum of three uniformsMediumProbabilityRandom Variables Premium
- Minimum of two exponentialsMediumProbabilityRandom Variables Premium
- Order statistics of two uniformsMediumRandom VariablesStatistics Premium
- Rare-event Poisson approximationMediumProbabilityRandom Variables Premium
- Sampling an exponential from a uniformMediumRandom VariablesProgramming & DSA Premium
- Shape of the normalMediumRandom VariablesStatistics Premium
- Standard error of a proportionMediumRandom VariablesStatistics Premium
- Sum of independent PoissonsMediumProbabilityRandom Variables Premium
- Sum of squared standard normalsMediumRandom VariablesStatistics Premium
- The larger die shows a 4MediumProbabilityRandom Variables Premium
- The probability integral transformMediumRandom VariablesStatistics Premium
- Uncorrelated but dependentMediumRandom VariablesStatistics Premium
- Variance from a uniform dieMediumRandom VariablesExpected Value Premium
- Variance of a difference, correlatedMediumRandom VariablesStatistics Premium
- Variance of a waiting timeMediumRandom VariablesStatistics Premium
- A divergent reciprocal expectationHardRandom VariablesCalculus Premium
- Best-of-seven underdogHardProbabilityRandom Variables Premium
- Correlation of min and maxHardProbabilityRandom Variables Premium
- Covariance of multinomial countsHardRandom VariablesStatistics Premium
- Expected flips for HHHardRandom VariablesExpected Value Premium
- Order statistics are BetaHardRandom VariablesStatistics Premium
- Ratio of two normalsHardRandom VariablesStatistics Premium
- Uniforms summing past 1HardRandom VariablesExpected Value Premium
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