lae270
29.10.2019 •
Mathematics
Suppose that the lifetime of tv tubes are normally distributed with a standard deviation of 1.1 years. suppose that exactly 20% of tubes die before four years. find the mean lifetime of tv tubes?
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Ответ:
35 dollars each
Step-by-step explanation: Because if you take the $40 out of 180 you get 140 then you divide 140 by 4 and you get 35. Hope this helps.