Answer
a
(i) 75%
(ii) 88.89%
b.
k = 2.5
Work Step by Step
a. (i)
$x±2s, k=2, 1-\frac{1}{2^2} = 3/4*100 = 75%
2365±2(340) = [1685, 3045]$
(ii)
$x±3s, k=3, 1-\frac{1}{3^2} = (1-1/9)\times100 = 88.89%
2365±3(340) = [1345, 3385]$
b.
$1-1/(k^2) = 0.84$
$K^2 = 1/0.16$
$K = 2.5$
