Question 857153
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Hi,
90%	z =1.645
92%	z = 1.751
95%	z = 1.96
98%	z = 2.326
99%	z = 2.576
ME = .5 ={{{ 1.645(1.8/sqrt(n)))}}}
  sqrt(n) = 1.645*1.8/.5 = 5.922   
       n= 35.07 0r  approximately 36