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The income distribution of a country is estimated by the Lorenz curvef(x)=0.28x 3 +0.19x 2 +0.53x Step 1 of 2: What percentage of the country's

The income distribution of a country is estimated by the Lorenz curvef(x)=0.28x3+0.19x2+0.53x

Step 1 of 2:What percentage of the country's total income is earned by the lower80% of its families? Write answer as a percentage rounded to the nearest whole number.

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