According to a December 2008 report from the Join Together website of the Boston University School of Public Health, approximately half (42%) of U.S. children are exposed to secondhand smoke on a weekly basis, with more than 25% of parents reporting that their child has been exposed to smoke in their homes. This statistic was one of many results from the Social Climate Survey of Tobacco Control [www.socialclimate.org/]. Use the normal approximation to the binomial distribution to find the probability that in a poll of 1200 randomly selected parents, between 450 and 500 inclusive will report that their child has been exposed to smoke on a weekly basis.
Source: www.jointogether.org
a. Solve using normal approximation and Table 3 in Appendix B.
b. Solve using a computer or calculator and the normal approximation method.
c. Solve using a computer or calculator and the binomial probability function.