The set of life spans of an appliance is normally distributed with a mean mc013-1.jpg = 48 months and a standard deviation mc013
-2.jpg = 8 months. What is the life span of an appliance that has a z-score of –3?
2 answers:
The life span would be 24 months.
The formula for z-scores is:

Using the information we're given we have:

Multiply both sides by 8 to cancel it:
-3(8) = ((X-48)/8)*8
-24 = X-48
Add 48 to both sides:
-24+48 = X-48+48
24=X
The answer would be B. 24 as the guy ^ said.
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Step-by-step explanation:
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