Practice Japan questions with answers and explanations.
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Mean = (15 + 4 + 10 + 19)/4 = 12.
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f(7)=4×7+11=39.
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10% of 34 = 3.4.
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Area = 10 × 5 = 50 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(10,3) = 120.
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Probability = favourable outcomes ÷ total outcomes.
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Mean = (5 + 6 + 11 + 11)/4 = 8.25.
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f(7)=6×7+10=52.
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Mean = (8 + 21 + 9 + 29)/4 = 16.75.
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f(7)=2×7+3=17.
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10% of 46 = 4.6.
