Question

0 Oxygen demand is a term biologists use to desoribe the oxygen needed by fish and other aquatic organisms for survival. The Environmental Protection Agency conducted a studly of a represents oxygen demand in this wetland environment. Assume x has a probability distrbution that is approximately nomal enworment, the-ory demand was μ_91ng Iweh 95% ofthe data ranging from 6 5 mgL to 11.7mg. iet r be aradn var able t (a) Use the 95% data rvge to estimate the stan d demoon sor ooygen den.and. (b) An oxygen demand below 8 indicates that some (Round your answer to four decimal places) organisms in the wetland envronment may be dying, what is the probabilty that the onygen demand below 8 ngiu (c) A high oxygen demand can also indicate trouble. An oxygen demand above 12 may indicate an overabundance of probability that the oexygen demand will exceed 12 orgatiams that endanger some types of plent ite. wWhat is tne mg/h. (Round your answer to four decimal places. Need Help? İhtru

Answer 1

Hence, P(x < 8) P(z <-0.829) From normal distribution table; P(Z <0.829) 0.2035 Hence, probability that oxygen demand falls below 8 mg/L 0.2035 Part-C: Probability that oxygen demand exceeds 12 mg/L: P(x > 12) Z-score for(x 12 12 9.1 1.327 > z- 2.186 Hence, P(x > 12) P(z > 2.186) From normal distribution table; P(z > 2.186) 0.0144 Hence, probability that oxygen demand exceeds 12 mg/L 0.0144