SOLUTION: The performance level of manufactured objects tends to vary within upper and lower bounds. Answer the question by assuming the measurements for each product are normally distribute
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Question 888104: The performance level of manufactured objects tends to vary within upper and lower bounds. Answer the question by assuming the measurements for each product are normally distributed. The mean number of gallons that are purified by a certain brand of water filter is 1200 and the standard deviation is 120 gallons. What percentage of these filters can be expected to purify more than 1440 gallons of water? Answer by skartikey(21) (Show Source):
You can put this solution on YOUR website! P(x>1440)=P(z>(1440-1200)/120)
=P(z>2)
=1-P(z<2)
=1-0.9772
=0.0228
=2.28%
2.28% of these filters can be expected to purify more than 1440 gallons of water.
