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Calculating averages from grouped data - KS3 Maths - BBC

Learn about calculating averages from grouped data with this BBC Bitesize Maths article. For students between the ages of 11 and 14.
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Grouped Data Exponentially Weighted Moving Average Control Charts

Stefan H. Steiner, Grouped Data Exponentially Weighted Moving Average Control Charts, Journal of the Royal Statistical Society. Series C (Applied Statistics), Vol. 47, No. 2 (1998), pp. 203-216 ...