Every flip and roll uses your browser's random number generator, so each run is different. The shaded funnel shows where the relative frequency usually stays (about 95% of the time) for that many trials.
The worked solution appears line by line in the lower band after a correct answer, or when you ask for it.
Your jobPick the exact probability for each event. Right answers add 1 point and grow your streak. A wrong answer shows why and costs 3 seconds. Keys 1 to 4 pick an answer.
Dice, coins, cards, marbles and the rules from the walkthrough: complement, addition and multiplication.
Fictional people and practice numbers to learn the math. Not medical guidance.
Wrong picks are fine here. Each one tells you why.