## Introductory Statistics 9th Edition

$a. 220±20k= [180, 260], k = (220-180)\div20 = 2$ $Minimum \ percentage = 1-\frac{1}{2^2} = 3/4*100 = 75%$ $b. 220±20k = [160, 280], k = (220-160)\div20 = 3$ $Minimum \ percentage = 1-\frac{1}{3^2} = 8/9*100 = 88.89%$ $c. 220±20k = [170, 270], k = (220-170)\div20 = 2.5$ $Minimum \ percentage = 1-\frac{1}{2.5^2} = 0.84*100 = 84%$
$a. 220±20k= [180, 260], k = (220-180)\div20 = 2$ $Minimum \ percentage = 1-\frac{1}{2^2} = 3/4*100 = 75%$ $b. 220±20k = [160, 280], k = (220-160)\div20 = 3$ $Minimum \ percentage = 1-\frac{1}{3^2} = 8/9*100 = 88.89%$ $c. 220±20k = [170, 270], k = (220-170)\div20 = 2.5$ $Minimum \ percentage = 1-\frac{1}{2.5^2} = 0.84*100 = 84%$