# Probability and statistics

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

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

## Seventh-grade skills

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

## Eighth-grade skills

- BB.1Probability of simple events
- BB.2Probability of opposite, mutually exclusive, and overlapping events
- BB.3Experimental probability
- BB.4Make predictions
- BB.5Compound events: find the number of outcomes
- BB.6Identify independent and dependent events
- BB.7Probability of independent and dependent events
- BB.8Factorials
- BB.9Permutations
- BB.10Counting principle
- BB.11Combination and permutation notation
- 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.5Quartiles
- CC.6Identify representative, random, and biased samples

## 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.1Mean, median, mode, and range
- KK.2Quartiles
- KK.3Identify biased samples
- KK.4Mean absolute deviation
- KK.5Variance and standard deviation

## 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

## 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.14Use normal distributions to approximate binomial distributions
- Z.1Identify biased samples
- Z.2Variance and standard deviation
- Z.4Identify an outlier
- Z.5Identify an outlier and describe the effect of removing it