7.SP.B.4 Grade 7 · Statistics and ProbabilityUse measures of center and measures of variability for numerical data from random samples to draw informal comparative inferences about two populations.Common Core State Standards for Mathematics, as adopted in the Massachusetts Curriculum Framework for Mathematics (2017), Grade 7.
Play the game: Center and Spreadfree, no sign-up →Data is counted as dots on a line plot before any average is named, so the shape of the data is seen first.
Every page is free and open — nothing to install, no account, and it works on a phone or a classroom board. Every number has its own color: 1 red, 2 orange, 3 yellow, 4 green, 5 blue, 6 purple, 7 brown, 8 pink, 9 cyan, and a number is that many colored dots.
7.SP.A.1A random sample stands for the whole; a biased one does not7.SP.A.2Many samples: estimate the whole and how far off a guess can be7.SP.B.3Two groups: the difference of means as a multiple of the spread, and how much they overlap7.SP.C.5Chance is a number from 0 to 1: place a bag on the line, then build a bag with a given chance7.SP.C.6Run the experiment: predict about how many in 300 draws, watch the fraction settle, find a hidden bag from data7.SP.C.7Probability models: equal-part spinners, a model from observed spins, and when model and data disagree7.SP.C.8Compound events with trees and tables: two coins, a coin and a die, two diceColorMyMath · getridoftheteacher.com · every number has its own color, and a number is that many colored dots. Matching a game to a standard is a judgement call; the official text is at doe.mass.edu.