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Nikolay [14]
2 years ago
13

I will mark you BRAINLIST please help with all 3 and show work on a paper please I need this thank you !!

Mathematics
1 answer:
o-na [289]2 years ago
8 0
I hope you can understand this :)

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Twenty five heat lamps are connected in a greenhouse so, that when one lamp fails, another takes over immediately (only one lamp
olga55 [171]

Answer:

P = 0.006

Step-by-step explanation:

Given

n = 25 Lamps

each with mean lifetime of 50 hours and standard deviation (SD) of 4 hours

Find probability that the lamp will be burning at end of 1300 hours period.

As we are not given that exact lamp, it means we have to find the probability where any of the lamp burning at the end of 1300 hours, So we have

Suppose i represents lamps

P (∑i from 1 to 25 (X_i > 1300)) = 1300

= P(X^{'}> \frac{1300}{25})                  where X^{'} represents mean time of a single lamp

= P (Z> \frac{52-50}{\frac{1}{\sqrt{25}}})                Z is the standard normal distribution which can be found by using the formula

Z = Mean Time (X^{'}) - Life time of each Lamp (50 hours)/ (SD/\sqrt{n})

Z = (52-50)/(4/\sqrt{25}) = 2.5

Now, P(Z>2.5) = 0.006 using the standard normal distribution table

Probability that a lamp will be burning at the end of 1300 hours period is 0.006

4 0
3 years ago
what is peter's number? "if you subtract 12 from my number and multiply the difference by -3, the result is -54
lara31 [8.8K]

Answer:

30

Step-by-step explanation:

-54/-3 = 18

18+12 = 30

7 0
3 years ago
PLEASE HELP ASAP
Ahat [919]

Answer:

5x+32

Step-by-step explanation:

So write out as an expression

Amy= x

Baz = x+8

Carla = 3(x+8)

Total= x +x + 8 +3x+ 24

= 5x+32

8 0
2 years ago
What is the slope of the line through (-1, 2) and (-3, -2)
Juli2301 [7.4K]

2

Step-by-step explanation:

-2 -2/ -3+1 = -4/-2 = 2

you just have to use the slope formula

6 0
2 years ago
Read 2 more answers
Plz help!
Thepotemich [5.8K]

Answer:

20

Step-by-step explanation: -13 to 7 think about that. We have to add 13 to make it 0. Then we add 7. So 13 plus 7 is 20. Enjoy :)

4 0
3 years ago
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