Answer
$i. 200±k(20) = [160,240]$
$200-20k = 160$
$k = 2$
$1-\frac{1}{2^2} = (1-0.25) \times100 = 75%$
$ii. 200±k(20) = [140,260]$
$200-20k = 140$
$k = 3$
$1-\frac{1}{3^2} = (1-1/9)\times100 = 88.89%$
$b. 1-\frac{1}{k^2} = 0.84$
$k^2 = 1\div 0.16$
$k = 2.5$
$Interval = [200 - 2.5(20), 200+2.5(20)]$
$= [150, 250]$
Work Step by Step
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