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Mathematics, 06.05.2021 01:00 sherlock19

The table shows all students in each year group of a school. The headteacher wants to do a survey.
She decides to take a stratified sample of 80 students to interview.

Year GroupNo. of StudentsSample
Year 7120a
Year 8160b
Year 9220c
Year 10170d
Year 11130e

Work out the missing values a to e
.


The table shows all students in each year group of a school. The headteacher wants to do a survey

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