Incorrect. There were 49.7 million people with some type of long-lasting condition or disability living in the United States in 2000. This represented 19.3 percent of the majority of civilians aged five and over (http://factfinder.census.gov). A sample of 1000 persons is selected at random. Use normal approximation. Round the answers to four decimal places (e.g. 0.9876). (a) Approximate the probability that more than 206 persons in the sample have a disability. i 0.14878 (b) Approximate the probability that between 180 and 300 people in the sample have a disability. i 0.8512 Your answer is partially correct. The time to failure (in hours) for a laser in a cytometry machine is modeled by an exponential distribution with = 0.00004. Round the answers to 3 decimal places. (a) What is the probability that the laser will last at least 20457 hours? 0.4412 (b) What is the probability that the laser will last at most 30608 hours? i 0.294 (c) What is the probability that the laser will last between 20457 and 30608 hours? 0.1472 Assume X is normally distributed with a mean of 10 and a standard deviation of 2. Determine the following: (Round your answer to 5 decimal places.) Part 1 Correct. P(X 9) i Statistical Tables and Charts Attempts: 1 of 3 used