Browsing as Guest. Progress, bookmarks and attempts are disabled.
Log in to track your work.
June 2006 p6 q7
3056
A survey of adults in a certain large town found that 76% of people wore a watch on their left wrist, 15% wore a watch on their right wrist and 9% did not wear a watch.
A random sample of 14 adults was taken. Find the probability that more than 2 adults did not wear a watch.
Solution
Let the probability that an adult does not wear a watch be 0.09. We are dealing with a binomial distribution where the number of trials is 14 and the probability of success (an adult not wearing a watch) is 0.09.
We need to find the probability that more than 2 adults do not wear a watch, which is equivalent to finding: