Consider the situation below and give the relevant proportion using correct notation. A survey conducted of 2064 randomly selected U.S. senior citizens cell phone owners, aged 65 and above, found that 337 of them say they still use a "flip" phone.
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A random sample of adults was asked to respond to a survey about whether they use their cell phones to shop for a specific item. One question, summarized in the table below reflecting probabilities, asked each respondent to choose whether or not they use a cell phone app to shop. The major age groupings were under 40 or 40 years or older. Age | Yes | No | Total --- | --- | --- | --- Under 40 | 0.4 | 0.2 | 0.6 40 or Older | 0.1 | 0.3 | 0.4 Total | 0.5 | 0.5 | 1 Given that a person chosen from the group does not use a cellphone to shop, what is the probability that this person is 40 years or older?
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