I think 20->a , 21->a , 22->b.
Not sure. Its impossible to find the coefficients by knowing just the mean right, deviations matter.
b1={Exiyi/E(xi^2) } where E is summation and xi and yi are deviations of Xi and Yi from their respective means
But since deviation is unknown, some average relation is known, R^2 is greater than 0.
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