Practice Japan questions with answers and explanations.
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Probability = favourable outcomes ÷ total outcomes.
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Mean = (7 + 11 + 4 + 18)/4 = 10.
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f(7)=4×7+8=36.
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10% of 46 = 4.6.
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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(9,2) = 36.
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Probability = favourable outcomes ÷ total outcomes.
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Mean = (17 + 9 + 3 + 26)/4 = 13.75.
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f(7)=2×7+9=23.
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10% of 38 = 3.8.
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Area = 12 × 10 = 120 cm².
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Use combinations: C(10,4) = 210.
