Statistics
Mean and averages194 problems · 14 skills
Arithmetic, geometric and harmonic means 17Average salaries and wages 6🔒Average weight 17🔒Averages of ages and weights 9🔒Averages of groups 18🔒Batting averages 7🔒Correcting the mean 18🔒Erased numbers and the mean 14🔒Mean and median of weights 7🔒Mean of grouped data 18🔒Mean of simple lists 17🔒Mean when members join or leave 18🔒Missing value from the mean 10🔒Score needed for a target average 18🔒
Median and mode69 problems · 4 skills
Lists with given mean and median 18Mean and median together 18🔒Median 16🔒Mode 17🔒
Range, quartiles and spread90 problems · 7 skills
Interquartile range and outliers 16Mean deviation 17🔒Percentiles and quartiles 11🔒Quartiles and five-number summary 6🔒Range of data 7🔒Standard deviation and skewness 16🔒Variance 17🔒
Normal distribution24 problems · 2 skills
Sampling and inference64 problems · 6 skills
Capture-recapture estimates 5Critical values 6🔒Estimates from samples 4🔒Hypothesis tests and power 14🔒Sample size and margin of error 17🔒Stratified sampling 18🔒
Charts, tables and regression32 problems · 2 skills
Pie charts and survey percentages 16Regression and correlation 16🔒