Please help with the problem below The articleSolutionn2667

Please help with the problem below.

The article

n=2667

social networking users = 1200

p for this sample = 1200/2667 = 0.4499

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b) Std error ^2 = 0.4499(1-04499)/2667 = 0.0031

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P(X<0.50) = P(Z<

= P(Z<16.16) =0