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2 years ago

8

An office manager has received a report from a consultant that includes a section on equipment replacement. The report indicates

that scanners have a service life that is normally distributed with a mean of 41 months and a standard deviation of 4 months. On the basis of this information, determine the proportion of scanners that can be expected to fail within plus or minus 6 months of the mean. (Enter your answer as a percentage without the percent sign; keep 2 decimal places)

1 answer:

Umnica [9.8K]2 years ago

5 0

Answer:

The answer is "36.14%"

Step-by-step explanation:

The complete question is given in the attached file please find it.

$\mu =41\\\\\sigma= 4\\\\P(42$

Using z-table to find the value.

$\to P(41$

This means that between 42 and 48 months, 36.14 % of scanners could be predicted will break down.

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Step-by-step explanation:

Given

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Cost of top wall $c_t=50\times l\times h=50lh$

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$\frac{\mathrm{d} C}{\mathrm{d} l}=0$

$-\frac{350}{l}+80l^2=0$

$l^3=\frac{350}{80}$

$l=1.627 ft$

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2(7m−5)+(−8+9m)

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