Step by step
The question
Question: A spinner with 3 equal parts landed on yellow 21 times in 50 spins.
Predict the yellows in 1,000 spins.
1 Times it happened over times tried
It happened 21 times out of 50 spins.
So the experimental probability is 21/50.
P(yellow) = 2150
Experimental probability comes from what really happened in the experiment.
experimental = what really happened
2 Predict
We expect the same fraction in 1000 spins: 21/50 of 1000.
Of means times.
= 2150 × 1000
1000 divided by 50 is 20.
1000 ÷ 50 = 20
Then times 21.
= 21 × 20
So about 420.
= ≈ 420
Careful!
A prediction is only about how many.
The next spins can come out a bit different.
Careful: about, not exactly: chance can change it
3 Check
Let's check: 420 out of 1000 is 21/50, the same fraction as before.
So the answer is right!
4201000 = 2150
Let's look back.
First: times it happened over times tried.
Then: predict.
Last: check.
Answer
Careful: about, not exactly: chance can change it