An appliance manufacturer gives a warranty and 95 percent of its appliances do not require repair before the warranty expires. An organization buys 10 of these appliances. Calculate an interval that contains 95.44 percent of all the appliances that will not require repair.
A) [8.12, 10.88]
B) [7.43, 11.57]
C) [8.81, 10.19]
D) [8.55, 10.45]

Question

Quizplus · Accepted Answer

μ = np = 10(.95) = 9.5
σ === .6892
95.44% is a 2-standard-deviation interval: [μ ± 2σ] = [9.5 ± 2(.6892)]
= [8.12, 10.88]

An Appliance Manufacturer Gives a Warranty and 95 Percent of Its