can u help me please?

Mathematics
Tutor: None Selected Time limit: 1 Day

42% of a random sampling of 800 people felt that skim milk was as nutritional as whole milk. Find the margin of error for this sampling.
a.
0.0348999
c.
0.0003045
b.
0.58
d.
0.2436
May 18th, 2015

the correct answer is 

c.

0.0003045

May 18th, 2015

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