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seraphim [82]
3 years ago
13

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?
Mathematics
2 answers:
elena55 [62]3 years ago
7 0
The life span would be 24 months.

The formula for z-scores is:
z=\frac{X-\mu}{\sigma}

Using the information we're given we have:
-3=\frac{X-48}{8}

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
MA_775_DIABLO [31]3 years ago
5 0
The answer would be B. 24 as the guy ^ said.
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