Question: r of quartz cr,'stal hes.A time researchers have shown th th ccrctime a full refund on any defective watch for before certain . The


r of quartz cr,'stal hes.A "time researchers have shown th th ccrctime a full refund on any defective watch for before certain . The stan rd deviation E months, and the distribution cf lifetim 2 after entage cf total will the expect to makes, long should the g If 20 months tee period watch repla? (Round yc (S) If Accrotime do s not want to refunds o cf the (to the n
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