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2 years ago

6

lavatory tests show that the lives of light bulbs are normally distributed with a mean of 750 hours and a stoandard devotion of

75 hours. Find the porbability that a randomly selected light bulb will last between 900 and 975 yours

1 answer:

maria [59]2 years ago

5 0

Answer:h

Step-by-step explanation:6

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3 years ago

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umka21 [38]

$A.\\-vp+40 < 95\qquad\text{subtract 40 from both sides}\\\\-vp < 55\qquad\text{change the signs}\\\\vp > -55\qquad\text{divide both sides by p}\\\\If\ p > 0\ then\ v>-\dfrac{55}{p}.\\\\If\ p < 0\ then\ v < -\dfrac{55}{p}$

$B>\\8w-3r=45\qquad\text{subtract 8 from both sides}\\\\-3r=-8w+45\qquad\text{change the signs}\\\\3r=8w-45\qquad\text{divie both sides by 3}\\\\r=\dfrac{8w-45}{3}$

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3 years ago

Joan drew a rectangle that is 4 centimeters by 10 centimeters. It has an area of 40 square centimeters and a perimeter of 28 cen

matrenka [14]

Hello!

First you find what numbers give you the same perimeter

9 + 9 + 6 + 6 = 30

5 + 5 + 8 + 8 = 26

7 + 7 + 4 + 4 = 22

6 + 6 + 8 + 8 = 28

The choice that has the same perimeter is D

The answer is D) 6 centimeters by 8 centimeters

Hope this helps!

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3 years ago