According to an almanac, 70% of adult shokers started si (a) Compute the mean and standard deviation of the random variable X, the number of smokers who started before 18 in 100 trials of the probability experiment. (b) Interpret the mean. (c) Would it be unusual to observe 90 smokers who started smoking before turning 18 years old in a random sample of 100 adult smokers? Why? (a) x = 70 ox= 4.6 (Round to the nearest tenth as needed.) (b) What is the correct interpretation of the mean? A. It is expected that in a random sample of 100 adult smokers, 70 will have started smoking before turning 18. OB. It is expected that in a random sample of 100 adult smokers, 70 will have started smoking after turning 18. OC. It is expected that in 50% of random samples of 100 adult smokers, 70 will have started smoking before turning 18 (c) Would it be unusual to observe 90 smokers who started smoking before turning 18 years old in a random sample of 100 adult smokers? OA. No, because 90 is less than μ-2o. OB. No, because 90 is greater than u + 2o. OC. No, because 90 is between μ-2o and μ+20. OD. Yes, because 90 is greater than μ + 20. OE. Yes, because 90 is between μ-20 and μ + 20. D

Suppose weights, in pounds, of dogs in a city have an unknown distribution with mean 31and standard deviation 5 pounds. A sample of size n=39 is randomly taken from the population and the sum is taken. What is the probability that the resulting sum is between 1180 and 1194 pounds?

The mean GPA for students in School A is 3.0; the mean GPA for students in School B is 2.8. The standard deviation in both schools is 0.25. The GPAs of both schools are normally distributed. If 9 students are randomly sampled from each school, what is the probability that: (a) the sample mean for School A will exceed that of School B by 0.5 or more? (b) the sample mean for School B will be greater than the sample mean for School A?

According to an almanac, 80% of adult smokers started smoking before turning 18 years old. (a) Compute the mean and standard deviation of the random variable X, the number of smokers who started before 18 in 300 trials of the probability experiment. (b) Interpret the mean. (c) Would it be unusual to observe 255 smokers who started smoking before turning 18 years old in a random sample of 300 adult smokers? Why? D= 1 (e) O, =(Round to the nearest tenth as needed.) (b) What is the correct interpretation of the mean? O A. It is expected that in a random sample of 300 adult smokers, 240 will have started smoking before turning 18. O B. It is expected that in a random sample of 300 adult smokers, 240 will have started smoking after turning 18. OC. It is expected that in 50% of random samples of 300 adult smokers, 240 will have started smoking before turning 18. (c) Would it be unusual to observe 255 smokers who started smoking before turning 18 years old in a random sample of 300 adult…