A survey found that people keep their TV\'s an average of 4.4 years. The standar
ID: 3436764 • Letter: A
Question
A survey found that people keep their TV's an average of 4.4 years. The standard deviation is 0.7. If a person decides to buy a new TV, find the probability that they woned the old one for the given amount of time. Assume the random variable is normally distributed.
Refer to the table of values (area under the standard normal distribution) as needed. If necesssary round intermediate calculations to the nearest hundredth.
More than 2.5 years
The probability that a randomly selected person has owned their TV for more than 2.5 years is _____%
Can you show me how you got your answer?
Explanation / Answer
We need to find P(X>2.5)
Use NORM.DIST function in excel we get 0.003321
Since we need to find P(X>2.5), we do 1-0.003321=0.9966
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