(iii) (10%) Suppose that the daily co oncentration follows a log-normal distribution. What is the probability that the daily concentration of pollutants in the river would not exceed the critical level (100 mg/l)?

3.[10%] Laboratory tests are performed to evaluate the compressive strengths for 2 types of concrete (A and (B). 10 specimens are used for each type of concrete. The sample standard deviati tions are 200 kPa and 250 kPa for concrete A and concrete B, respectively. Construct a 90% confidence interval for the ratio of the 2 population variances

題組內容

(iii) (10%) Suppose that the daily co oncentration follows a log-normal distribution. What is the probability that the daily concentration of pollutants in the river would not exceed the critical level (100 mg/l)?

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