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The maple leaf is the only red leaf. What if the leaf you picked was the only one of its kind? You cannot tell if you only do the experiment once. You should get at least 3 leaves from each type of tree to check the red leaf is not an [[anomaly]].
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==Key Stage 3==
===Meaning===
A '''repeat''' is when exactly the same [[experiment]] is done again.
===About Repeats===
: [[Repeat]]s are done in order to check for [[Anomaly|anomalies]] and are used to calculate an [[Mean Average|average]] (this reduces the effects of [[Random Error|random errors]]).