In a survey of consumers aged 12 and older conducted by Frank N. Magid Associates, respondents were asked how many cell phones were in use by the household. Among the respondents, 211 answered “none,” 288 said “one,” 366 said “two,” 144 said “three,” and 89 responded with four or more. Find the probability that a randomly selected household has four or more cellphones in use. Is it unusual for a household to have four or more cell phones in use?