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Solution
a)
No. of students own shares of stock among 20 (x)=8
Sample Size(n)=20
Sample proportion = x/n = 8/20 = 0.4
b)
Standard Error = Sqrt(p*(1-p)/n))
x = Mean
n = Sample Size,
Sample Size(n)=20
proportion =0.4
Standard Error = Sqrt ( (0.4*0.6) /20) )
= 0.1095
