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Nostrana [21]
3 years ago
12

Help me with dis pls

Mathematics
1 answer:
Iteru [2.4K]3 years ago
3 0

Answer:

53, -84, 24, -38

Step-by-step explanation:

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Quality control studies for Speedy Jet Computer Printers show the lifetime of the printer follows a normal distribution with mea
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Step-by-step explanation:

Given : Quality control studies for Speedy Jet Computer Printers show the lifetime of the printer follows a normal distribution with

mean \mu = 4 and standard deviation  \sigma = 0.78

If the company wishes to replace no more than 10% of the printers.

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Solution :

Using Z- table,  

Z value corresponding to 10% or 0.10 = -1.28.

Applying z-score formula,

z=\frac{x-\mu}{\sigma}

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