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MeanSum of all values divided by the count. Mean of 4, 7, 6 is
(4+7+6) ÷ 3 = 5.67.MedianThe middle value when ordered. Median of 4, 6, 7 is 6.
ModeThe most-frequent value. Mode of 4, 7, 7, 9 is 7.
BIDMASOrder of operations: Brackets, Indices, Division, Multiplication, Addition, Subtraction.
Pythagoras’ theorem
a² + b² = c² for any right-angled triangle, where c is the hypotenuse.Quadratic formula
x = (−b ± √(b²−4ac)) ÷ 2a solves any equation of the form ax² + bx + c = 0.Standard formA number written as
A × 10n where 1 ≤ A < 10. Speed of light = 3 × 10⁸ m/s.UCAS pointsA-Level grade-to-points conversion for UK university entry. A* = 56, A = 48, B = 40, C = 32, D = 24, E = 16.
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