A Gallup poll on Presidents Day 2008 interviewed a random sample of 1007 adult A

Question

A Gallup poll on Presidents Day 2008 interviewed a random sample of 1007 adult Americans. They were asked which former president they would like to bring back as the next president if they could. Here are the results: These proportions are estimates of probabilities for the random phenomenon of choosing an adult American at random and asking her or his opinion. What must be the probability that the person chosen selects someone other than John F. Kennedy, Ronald Reagan, or Abraham Lincoln? Fill in the blank: The event "I would select either John F. Kennedy or Ronald Reagan" contains the first two outcomes. Its probability is _ (Give your answer to two decimal places.)

Explanation / Answer

we know that the sum of the probabiltiy distribution is 1

so we can calculate the required probability as 1- (0.23 +0.22+0.1) = 0.45

now we need to find the probability of Kennedy or Reagon

as it is an or , we add up the two probabilities as 0.23+0.22 = 0.45

Hope this helps !

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