In the United States the ages 13 to 55+ of smartphone users approximately follow a normal distribution with approximate mean and standard deviation of 36.9 years and 13.9 years respectively. Using this information, answer the following questions. What probability of cell phone users are between 40 and 49 years old? A) P(40 < x < 49) = 0.2197 B) P(40 < x < 49) = 0.5882 C) P(40 < x < 49) = 0.4118 D) P(40 < x < 49) = 0.8080

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