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Grouping can lose exact detail - Paper 1

Read the information, then answer the questions. An adult may read the instructions aloud. Show your working where asked.

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Grouped times in minutes: 10 <= t < 20 has frequency 5; 20 <= t < 30 has frequency 3. Exact individual times are not supplied. Use interval midpoints 15 and 25 to estimate the mean. Frequency is a count, not a time measurement.

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