Practice Mathematics I / A questions with answers and explanations.
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Mean = (15 + 19 + 5 + 34)/4 = 18.25.
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f(7)=2×7+3=17.
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10% of 30 = 3.
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Use combinations: C(11,3) = 165.
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Probability = favourable outcomes ÷ total outcomes.
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Mean = (8 + 17 + 4 + 25)/4 = 13.50.
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f(7)=6×7+4=46.
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10% of 42 = 4.2.
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Area = 3 × 18 = 54 cm².
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By Vieta’s formula, the sum of the roots is the coefficient of x with sign changed.
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Use combinations: C(12,2) = 66.
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Probability = favourable outcomes ÷ total outcomes.
