Practice Japan questions with answers and explanations.
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Mean = (17 + 5 + 9 + 22)/4 = 13.25.
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Area = 15 × 21 = 315 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(11,4) = 330.
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Probability = favourable outcomes ÷ total outcomes.
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Mean = (10 + 3 + 8 + 13)/4 = 8.50.
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f(7)=4×7+11=39.
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10% of 46 = 4.6.
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Area = 5 × 4 = 20 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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f(7)=2×7+3=17.
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10% of 38 = 3.8.
