Question: There are approximately one billion smartphone users in the world today. In the United States, the ages of smartphone users between 13 to 55 approximately

There are approximately one billion smartphone users in the world today. In the United States, the ages of smartphone users between 13 to 55 approximately follow a normal distribution with approximate mean and standard deviation of 37 years and 8 years, respectively.

Using the 68-95-99.7 Rule, what percent of smartphone users are between the ages of 29 and 45?

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