Probability Experiments: Predict, Spin and Tally

0:00Can we predict where this spinner will land?

0:03This spinner has 4 equal parts: 3 blue and 1 red.

0:08Blue covers 3 of the 4 parts, so we predict that landing on blue is likely.

0:14Red covers only 1 part, so landing on red is unlikely.

0:20There is no green part, so landing on green is impossible.

0:24Every part is red or blue, so landing on red or blue is certain.

0:30Now we spin 20 times to test our predictions.

0:34We make one tally mark for each spin.

0:41Every fifth mark goes across the other four.

0:57Count the blue marks: 5, 10, 11, 12, 13, 14.

1:05Red has 6 marks, and green has 0.

1:0914 plus 6 is 20, so every spin landed on red or blue.

1:15Blue came up most often, just as we predicted.

1:19If you try it, your counts may be a little different.

1:23Predict first, then spin and tally to check your prediction.