Replacement Times for TV Sets Are Normally Distributed with a Mean

question 6

Multiple Choice

Replacement times for TV sets are normally distributed with a mean of 8.2 years and a standard
Deviation of 1.1 years, (based on data from "Getting Things Fixed," Consumer Reports) .
(i. The replacement time that separated the top 20% from the bottom 80% is 9.124 years.
(ii. The probability that a randomly selected TV will be replaced after more than 10.0 years is
0) 0505.

• A) (i) and (ii) are correct statements.
• B) (i) is a correct statement but not (ii).
• C) (ii) is a correct statement but not (i).
• D) (i) and (ii) are false statements.

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Definitions:

Methylphenidate

A stimulant medication used primarily to treat attention deficit hyperactivity disorder (ADHD) and narcolepsy by increasing attention and controlling behavior.

Sleep Disturbances

Disruptions in normal sleep patterns, which can include difficulties falling asleep, staying asleep, or experiencing restorative sleep.

ADHD

Attention-Deficit/Hyperactivity Disorder, a neurodevelopmental disorder characterized by persistent patterns of inattention and/or hyperactivity-impulsivity that interfere with functioning or development.

Methylphenidate

A stimulant medication commonly used to treat Attention Deficit Hyperactivity Disorder (ADHD) and narcolepsy.