According to a recent survey, 71% of teens ages 12-17 in a certain country used social networks in 2009. A random sample selected. Complete parts a through d below. a. Calculate the standard error of the proportion. p=0.0383 (Round to four decimal places as needed.) b. What is the probability that less than 73% of the teens from this sample used social networks? P(Less than 73% of the teens from this sample used social networks) = (Round to four decimal places as needed.) 140 teenagers from this

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