0 Question 49 B 0.5/1 pt '0 3 8 98 G) Details The amount of pollutants that are found in waterways near large cities is normally distributed with mean 10 ppm and standard deviation 1.5 ppm. 15 randomly selected large cities are studied. Round all answers to 4 decimal places where possible. th . What is the distribution of X? X ~ N( , ) . What is the distribution of 5:? i ~ N( , ) . What is the probability that one randomly selected city's waterway will have more than 9.2 ppm pollutants? . For the 15 cities, find the probability that the average amount of pollutants is more than 9.2 ppm. . For part d), is the assumption that the distribution is normal necessary? 0 YesO No . Find the IQR for the average of 15 cities. Q1 = Ppm Q3 = Ppm IQR: ppm 0 Question 50 [Z 0.6/1 pt '0 3 2:3 98 6) Details The number of seconds X after the minute that class ends is uniformly distributed between 0 and 60. Round all answers to 4 decimal places where possible. a. What is the distribution of X? X ~ U( , ) then the sampling distribution is b. Suppose that 35 classes are clocked. What is the distribution of i for this group of classes? 5: ~ N( , ) c. What is the probability that the average of 35 classes will end with the second hand between 26 and 35 seconds? Question 7 [Z 0.75/1 pt '0 1-2 23 99 CD Details Score on last try: 0.75 of 1 pts. See Details for more. ('3 Get a similar question You can retry this question below 110 adults with gum disease were asked the number of times per week they used to floss before their diagnoses. The (incomplete) results are shown below: # of times floss per week Relative Frequency Cumulative Frequency -1-_ 0-1364 \" - 0.0m 0.1182 \" 0.1455 82 - o .- .-_il__ a. Complete the table (Use 4 decimal places when applicable) b. What is the cumulative relative frequency for flossing 2 times per week? -% Submit Question Jump to