For what value(s) of x is g continuous? g(x) = 0 if x is rational 4x if x is irrational x is in the set of real numbers x = 4 x = −4 x = 0 none of these

Study results indicate that the mean length of time people spend on a bus in a city is between 21.2 min and 24.5 min what is the study margin of the error?