Practice Japan questions with answers and explanations.
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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.
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Mean = (18 + 15 + 3 + 33)/4 = 17.25.
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f(7)=4×7+5=33.
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10% of 34 = 3.4.
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Area = 13 × 16 = 208 cm².
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By Vieta’s formula, the sum of the roots is the coefficient of x with sign changed.
