Multiply and simplify. 2x^4yx⋅6xy^2z^3 a) 12x^{6}y^{3}z^{3} b) 12(xyz)^{12} c) 12x^{4}y^{2}z^{3} d) 8x^{6}y^{3}z^{3}

Monthly water bills for a city have a mean of $108.43 and a standard deviation of $32.09. find the probability that a randomly selected bill will have an amount greater than $155, which the city believes might indicate that someone is wasting water. would a bill that size be considered unusual?