The most likely the UK's Qualifications and Curriculum Development Agency, which was closed down on 31 March 2012.
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The mean is usually the arithmetic mean - there are other means in maths. For a set of numbers, the arithmetic mean is the sum of the numbers divided by the number of numbers.
QCA. has written: 'Geographical enquiry at key stages 1-3'
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Quality Compliance Assurance or questions counting academy
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QCA tests, or Quantitative Chemical Analysis tests, are analytical techniques used to determine the composition and concentration of chemical substances in a sample. These tests employ various methods, such as spectroscopy, chromatography, and electrochemical analysis, to provide accurate and reliable quantitative data. QCA is essential in fields like pharmaceuticals, environmental monitoring, and food safety to ensure quality control and compliance with regulatory standards.
A expression in maths is a collection of terms without an equality sign.
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