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kenny6666 [7]
3 years ago
9

Please help me with this

Mathematics
1 answer:
hodyreva [135]3 years ago
5 0

Answer:

1.) The quotient of a number and 2 = x ÷ 2

2.) A number decreased by 2 = x - 2

3.) 2 times a number = 2x

4.) 2 increased by a number = 2 + x

Step-by-step explanation:

Let's look for key words hidden in these sentences:

1.) The <u>quotient</u> of a number and 2 = The word quotient refers to division

2.) A number <u>decreased</u> by 2 = The word decreased refers to subtraction

3.) 2 <u>times</u> a number = the word times refers to multiplication

4.) 2 <u>increased</u> by a number = the word increased refers to addition

Hope this helps!

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The average time before breakdown of a machine is normally distributed and has a mean of 18 weeks and a standard deviation of th
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Answer:

19.24 weeks

Step-by-step explanation:

Given that;

Mean, m = 18

Standard deviation, s = 3

Break down cost = 2000

Preventive maintenance cost = 1400

The optimal preventive maintenance level is Given by :

Mean + service level * standard deviation

Service level = preventive maintenance cost / (breakdown cost + preventive maintenance cost)

Hence,

Service level = 1400/(1400+2000) = 1400 / 3400

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Optimal preventive maintenance level :

18 + (0.4117647 * 3)

18 + 1.2352941

= 19.235

= 19.24 weeks

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3 years ago
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Step-by-step explanation:

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