Question 661107
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Hi,
 mean is 72mo and SD is 14mo
P(x &#8804; 60mo)= P((z &#8804; (60-72)/14) = P(z &#8804; -.8571) = .1957  0r 19.57%  

1,000,000 batteries would we expect to fail during their fifth year of life? 
 only 19.57% of them or 195,700