Answer
a. i. $7.3-k(2.2)=5.1$, k = 1,
By Empirical rule, when k =1, the minimum percentage will be 68%.
ii. 7.3-k(2.2)=0.7, k =3
By Empirical rule, when k =3, the minimum percentage will be 99.7%.
b.By Empirical rule, when k =2, the minimum percentage will be 95%
Interval = [7.3-(2)(2.2), 7.3+(2)(2.2)]
=[2.6, 11.7]
Work Step by Step
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