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Fittoniya [83]
3 years ago
9

A company manufactures CD drives that have a 1.6% chance of experiencing disc-read errors. If a CD drive is tested for 250 read

operations, the number of times it may fail is ? .
Mathematics
2 answers:
Digiron [165]3 years ago
4 0
1.6% of 250 = (1.6  *250) / 100  =  4 times
gregori [183]3 years ago
4 0

Answer:

The number of times CD drives may fail are 4 .

Step-by-step explanation:

Formula

Percentage = \frac{Part\ values\times 100}{Total\ value}

As given

A company manufactures CD drives that have a 1.6% chance of experiencing disc-read errors.

If a CD drive is tested for 250 read operations .

Percentage = 1.6 %

Total value = 250

Put all the values in the formula

1.6= \frac{Part\ values\times 100}{250}

Part\ value= \frac{1.6\times 250}{100}

Part\ value= \frac{400}{100}

Part value = 4

Therefore the number of times CD drives may fail are 4 .

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What numbers multiply to 6 and add up to 9
Nookie1986 [14]
Xy = 6
x + y = 9

     x + y = 9
x - x + y = -x + 9
           y = -x + 9

                                          xy = 6
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                            x(-x) + x(9) = 6
                                 -x² + 9x = 6
                            -x² + 9x - 6 = 0
              -1(x²) - 1(-9x) - 1(6) = 0
                       -1(x² - 9x + 6) = 0
                                 -1           -1
                             x² - 9x + 6 = 0
                             x = -(-9) ± √((-9)² - 4(1)(6))
                                                 2(1) 
                             x = 9 ± √(81 - 24)
                                            2
                             x = 9 ± √(57)
                                        2
                             x = 4.5 ± 0.5√(57)

                       x + y = 9
   4.5 ± 0.5√(57) + y = 9
- (4.5 ± 0.5√(57))    - (4.5 ± 0.5√(57))
                             y = 4.5 ± 0.5√(57)
                       (x, y) = (4.5 ± 0.5√(57), 4.5 ± 0.5√(57))

The two numbers that multiply to 6 and add up to 9 are 4.5 ± 0.5√(57).
6 0
3 years ago
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