A dataset has xˉ=10\bar{x} = 10xˉ=10 and yˉ=20\bar{y} = 20yˉ=20. If the regression line is y^=0.5x+b\hat{y} = 0.5x + by^=0.5x+b, what is the value of bbb?
b=10b = 10b=10
b=15b = 15b=15
b=20b = 20b=20
b=5b = 5b=5