in a study 45 of adults questioned reported that their healt

in a study 45% of adults questioned reported that their health was excellent . a researcher wished to study the health of people living close to a nulear power plant. among 10 adults randomly selected from this area, only 3 reported that thier health was excellent. find the probability that when 10 adults are randomly selected, 3 or fewer are in excellent health

Solution

Using a cumulative binomial distribution table or technology, matching          
          
n = number of trials =    10      
p = the probability of a success =    0.45      
x = the maximum number of successes =    3      
          
Then the cumulative probability is          
          
P(at most   3   ) =    0.266037945 [ANSWER]