A packet says 1 seed in 5 will fail. You plant 200 and 84 fail. Is the packet wrong, or is that just how seeds go? These free printable worksheets hand over a claim and a result and ask whether the two agree.
Every question here is answered the same way: work out what the claim predicts, then compare. A claim of “1 in k” over n tries predicts n ÷ k, and the numbers are chosen so that division is always whole — a question whose answer depends on how you rounded is not a question worth marking.
Why this sheet works
The three answers are “it fits”, “far too many” and “far too few”, and having to say WHICH WAY is what makes the page work. A student who only judges “that looks wrong” can guess; a student who has to choose between too many and too few has worked the expected count out.
How this one works
One question from a sheet like this one, worked a step at a time — with a sentence saying what just happened and why.
Work out what the claim predicts, then compare. Circle one.
1
A machine is said to make 1 faulty part in 10. In 400 parts 18 were faulty.
It fits the claimFar too manyFar too few
2
A packet says 1 seed in 10 fails. Of 300 planted, 27 failed.
It fits the claimFar too manyFar too few
3
A bag is said to hold 1 blue counter in 6. In 120 draws 17 were blue.
It fits the claimFar too manyFar too few
4
A machine is said to make 1 faulty part in 10. In 200 parts 44 were faulty.
It fits the claimFar too manyFar too few
5
A spinner is said to land on red 1 spin in 5. In 200 spins it did 18 times.
It fits the claimFar too manyFar too few
6
A machine is said to make 1 faulty part in 10. In 120 parts 28 were faulty.
It fits the claimFar too manyFar too few
Reading a study · Does the result fit the claim?Answer key
1. A machine is said to make 1 faulty part in 10. In 400 parts 18 were faulty. → Far too few — 1 in 10 of 400 is 40, and the result was 18.2. A packet says 1 seed in 10 fails. Of 300 planted, 27 failed. → It fits the claim — 1 in 10 of 300 is 30, and the result was 27.3. A bag is said to hold 1 blue counter in 6. In 120 draws 17 were blue. → It fits the claim — 1 in 6 of 120 is 20, and the result was 17.4. A machine is said to make 1 faulty part in 10. In 200 parts 44 were faulty. → Far too many — 1 in 10 of 200 is 20, and the result was 44.5. A spinner is said to land on red 1 spin in 5. In 200 spins it did 18 times. → Far too few — 1 in 5 of 200 is 40, and the result was 18.6. A machine is said to make 1 faulty part in 10. In 120 parts 28 were faulty. → Far too many — 1 in 10 of 120 is 12, and the result was 28.
