Online worksheet ยท 3 of 4
Grouping can lose exact detail - Online practice 3
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: 20 <= t < 30 has frequency 4; 30 <= t < 40 has frequency 1. Exact individual times are not supplied. Use interval midpoints 25 and 35 to estimate the mean. Frequency is a count, not a time measurement.
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