Mathematics, 01.03.2021 18:20 timozy95

Isobel gives a puzzle to some people and records how long they take to solve it. Some of her results are summarised in the histogram. Four people took 20 minutes or less to solve it. Work out the percentage of the people who took 30 minutes or more.

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Isobel gives a puzzle to some people and records how long they take to solve it. Some of her results...