# Probability and statistics

See recommended skills!Here is a list of all of the skills that cover probability and statistics! These skills are organized by grade, and you can move your mouse over any skill name to view a sample question. To start practicing, just click on any link. IXL will track your score, and the questions will automatically increase in difficulty as you improve!

## Sixth-grade skills

- HH.1Calculate mean, median, mode, and range
- HH.2Interpret charts to find mean, median, mode, and range
- HH.3Mean, median, mode, and range: find the missing number
- HH.4Calculate mean absolute deviation
- HH.5Identify representative, random, and biased samples
- II.1Combinations
- II.2Probability of one event
- II.3Make predictions
- II.4Probability of opposite, mutually exclusive, and overlapping events
- II.5Compound events - find the number of outcomes by counting
- II.6Identify dependent and independent events
- II.7Probability of dependent and independent events
- II.8Factorials
- II.9Permutations

## Seventh-grade skills

- CC.1Calculate mean, median, mode, and range
- CC.2Interpret charts to find mean, median, mode, and range
- CC.3Mean, median, mode, and range: find the missing number
- CC.4Changes in mean, median, mode, and range
- CC.5Calculate mean absolute deviation
- CC.6Identify representative, random, and biased samples
- DD.1Probability of simple events
- DD.2Probability of opposite, mutually exclusive, and overlapping events
- DD.3Experimental probability
- DD.4Make predictions
- DD.5Compound events: find the number of outcomes
- DD.6Identify independent and dependent events
- DD.7Probability of independent and dependent events
- DD.8Factorials
- DD.9Permutations
- DD.10Counting principle
- DD.11Combination and permutation notation

## Eighth-grade skills

- DD.1Calculate mean, median, mode, and range
- DD.2Interpret charts to find mean, median, mode, and range
- DD.3Mean, median, mode, and range: find the missing number
- DD.4Changes in mean, median, mode, and range
- DD.5Quartiles
- DD.6Identify an outlier
- DD.7Identify an outlier and describe the effect of removing it
- DD.8Outliers in scatter plots
- DD.9Scatter plots: line of best fit
- DD.10Identify representative, random, and biased samples
- EE.1Probability of simple events
- EE.2Probability of opposite, mutually exclusive, and overlapping events
- EE.3Experimental probability
- EE.4Make predictions
- EE.5Compound events: find the number of outcomes
- EE.6Identify independent and dependent events
- EE.7Probability of independent and dependent events
- EE.8Factorials
- EE.9Permutations
- EE.10Counting principle
- EE.11Combination and permutation notation

## Algebra 1 skills

- JJ.1Theoretical probability
- JJ.2Experimental probability
- JJ.3Compound events: find the number of outcomes
- JJ.4Identify independent and dependent events
- JJ.5Probability of independent and dependent events
- JJ.6Permutations
- JJ.7Counting principle
- JJ.8Permutation and combination notation
- KK.1Identify biased samples
- KK.2Mean, median, mode, and range
- KK.3Quartiles
- KK.4Identify an outlier
- KK.5Identify an outlier and describe the effect of removing it
- KK.6Mean absolute deviation
- KK.7Variance and standard deviation
- KK.9Outliers in scatter plots
- KK.10Match correlation coefficients to scatter plots
- KK.11Calculate correlation coefficients
- KK.13Find the equation of a regression line
- KK.14Interpret regression lines
- KK.15Analyze a regression line of a data set

## Algebra 2 skills

- CC.1Introduction to probability
- CC.2Calculate probabilities of events
- CC.3Counting principle
- CC.4Combinations and permutations
- CC.5Find probabilities using combinations and permutations
- CC.6Find probabilities using two-way frequency tables
- CC.7Identify independent events
- CC.8Probability of independent and dependent events
- CC.9Find conditional probabilities
- CC.10Independence and conditional probability
- CC.11Find conditional probabilities using two-way frequency tables
- CC.12Find probabilities using the addition rule
- CC.13Identify discrete and continuous random variables
- CC.14Write a discrete probability distribution
- CC.15Graph a discrete probability distribution
- CC.16Expected values of random variables
- CC.17Write the probability distribution for a game of chance
- CC.18Expected values for a game of chance
- CC.19Choose the better bet
- CC.20Find probabilities using the binomial distribution
- CC.21Find probabilities using the normal distribution
- DD.1Identify biased samples
- DD.2Variance and standard deviation
- DD.3Identify an outlier
- DD.4Identify an outlier and describe the effect of removing it
- DD.5Outliers in scatter plots
- DD.6Experiment design

## Precalculus skills

- X.1Introduction to probability
- X.2Calculate probabilities of events
- X.3Combinations and permutations
- X.4Find probabilities using combinations and permutations
- X.5Find probabilities using two-way frequency tables
- X.6Identify independent events
- X.7Find conditional probabilities
- X.8Independence and conditional probability
- X.9Find conditional probabilities using two-way frequency tables
- X.10Find probabilities using the addition rule
- Y.1Identify discrete and continuous random variables
- Y.2Write a discrete probability distribution
- Y.3Graph a discrete probability distribution
- Y.4Expected values of random variables
- Y.5Variance and standard deviation of random variables
- Y.6Write the probability distribution for a game of chance
- Y.7Expected values for a game of chance
- Y.8Choose the better bet
- Y.9Find probabilities using the binomial distribution
- Y.10Mean, variance, and standard deviation of binomial distributions
- Y.11Find probabilities using the normal distribution
- Y.12Find z-values
- Y.13Find values of normal variables
- Y.14Distributions of sample means
- Y.15The Central Limit Theorem
- Y.16Use normal distributions to approximate binomial distributions
- Z.1Identify biased samples
- Z.2Variance and standard deviation
- Z.3Identify an outlier
- Z.4Identify an outlier and describe the effect of removing it
- Z.5Outliers in scatter plots
- Z.6Match correlation coefficients to scatter plots
- Z.7Calculate correlation coefficients
- Z.8Find the equation of a regression line
- Z.9Interpret regression lines
- Z.10Analyze a regression line of a data set
- Z.11Analyze a regression line using statistics of a data set
- Z.12Find confidence intervals for population means
- Z.13Find confidence intervals for population proportions
- Z.14Interpret confidence intervals for population means
- Z.15Experiment design
- Z.16Analyze the results of an experiment using simulations