Two out of five adult smokers acquired the habit by age 14. If 400 smokers are randomly selected, find the probability that 170 or fewer acquired the habit by age 14.
Answer to relevant QuestionsA mail order company has an 8% success rate. If it mails advertisements to 600 people, find the probability of getting less than 40 sales. For the first 7 months of the year, the average precipitation in Toledo, Ohio, is19.32 inches. If the average precipitation is normally distributed with a standard deviation of 2.44 inches, find these probabilities. a. A ...Of the total population of the United States, 20% live in the northeast. If 200 residents of the United States are selected at random, find the probability that at least 50 live in the northeast. What is the difference between a point estimate and an interval estimate of a parameter? Which is better? Why? A random sample of 50 four-year-olds attending day care centers provided a yearly tuition average of $3987 and the population standard deviation of $630. Find the 90% confidence interval of the true mean. If a day care ...
Post your question