Question: The probability density function for the number of U.S. users of Facebook, a computer social network, was found to be where t was the number

The probability density function for the number of U.S. users of Facebook, a computer social network, was found to be S(t) = 1 1995 +32.66t 280.8) (-0.0000862114 + 0.01632t - 1.1281

where t was the number of years since birth on [14.4, 71.5]. Calculate the expected age of a Facebook user, as well as the standard deviation.

S(t) = 1 1995 +32.66t 280.8) (-0.0000862114 + 0.01632t - 1.1281

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