Practice japan-common-test-math-ia questions with answers and explanations.
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Use combinations: C(7,4) = 35.
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Probability = favourable outcomes ÷ total outcomes.
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Mean = (14 + 9 + 11 + 23)/4 = 14.25.
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f(7)=4×7+8=36.
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10% of 30 = 3.
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Area = 9 × 10 = 90 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(6,2) = 15.
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Probability = favourable outcomes ÷ total outcomes.
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Mean = (7 + 7 + 10 + 14)/4 = 9.50.
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f(7)=2×7+9=23.
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f(7)=6×7+10=52.
