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Advocard [28]
2 years ago
15

The amount of time a certain brand of light bulb lasts is normally distribued with a mean of 900 hours and a standard deviation

of 55 hours. Out of 720 freshly installed light bulbs in a new large building, how many would be expected to last between 800 hours and 1030 hours, to the nearest whole number?
Mathematics
1 answer:
max2010maxim [7]2 years ago
7 0

Answer: 689

Step-by-step explanation:

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12x + 3(x - 4) + 2x *<br> Your answer
AleksandrR [38]

Step-by-step explanation:

12x + 3(x - 4) + 2x

17x-12

HOPE IT HELPS U

8 0
3 years ago
8' by 4', use a scale factor of 1. 5 to enlarge a window, what will the area of the window be after it is enlarged?
solmaris [256]
Enlarging by 1.5 will make the lengths 12' and 6'. Area is L*W. 12*6=72
<span>72'^2</span>
6 0
3 years ago
I need help , help me find the answer to number four please
lakkis [162]
I believe it is H I hope this helps !!!!
4 0
3 years ago
If 8x+22=19x, then 3x=
Leni [432]

Answer:

6

Step-by-step explanation:

- *x both sides

divide eleven both sides

x =2

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7 0
3 years ago
Read 2 more answers
A journeyperson earns $28.75 per hour. A new apprentice earns 60% of the journeyperson's rate.
maxonik [38]

Answer:

$503.70

Step-by-step explanation:

$28.75 × .6 = $17.25

$17.25 × 40 = $690

$690 × .27 = $186.30

$690 - $186.30 = $503.70

8 0
2 years ago
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