  We investigate the measurement uncertainties of a triple of positive
operator-valued measures (POVMs) based on statistical distance, and formulate
state-independent tight uncertainty inequalities satisfied by the three
measurements in terms of triple-wise joint measurability. Particularly,
uncertainty inequalities for three unbiased qubit measurements are presented
with analytical lower bounds which relates to the necessary and sufficient
condition of the triple-wise joint measurability of the given triple. We show
that the measurement uncertainties for a triple measurement are essentially
different from the ones obtained by pair wise measurement uncertainties by
comparing the lower bounds of different measurement uncertainties.
