Suppose that we want to com pare the waiting times between repairs of two systems [in days}, 51 and 5'2 . Here are histograms of the waiting times: III II 3.4 I-l " I I C I I I ' Which of the following options is a reasonable conclusion from these histograms? 0 none of the preceding 0 only one ofthe populations is normal 0 the populations are not normal 0 the populations are normal with unequal variances O the populations are normal with equal variances