3 years ago

2+2+4= 8 x 12= .........

Mathematics

2 answers:

Sveta_85 [38]3 years ago

8 0

Answer:

Step-by-step explanation:

almond37 [142]3 years ago

3 0

Answer:

answer is 96

Step-by-step explanation:

96 os the answer of this question

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The life in hours of a 75-watt light bulb is known to be normally distributed with standard deviation σ = 25 hours. A random sam

irina [24]

Answer: a) (1008.34,1019.658) b) (1009.24,1018.76)

Step-by-step explanation:

Since we have given that

n = 75

mean = 1014 hours

Standard deviation = 25 hours

At 95% two sided , z = 1.96

So, confidence interval would be

$\bar{x}\pm z\dfrac{\sigma}{\sqrt{n}}\\\\=1014\pm 1.96\dfrac{25}{\sqrt{75}}\\\\=1014\pm 5.658\\\\=(1014-5.658,1014+5.658)\\\\=(1008.34,1019.658)$

(b) Construct a 95% lower confidence bound on the mean life.

z = 1.65

So, confidence interval would be

$\bar{x}\pm z\times \dfrac{\sigma}{\sqrt{n}}\\\\=1014\pm 1.65\times \dfrac{25}{\sqrt{75}}\\\\=1014\pm 4.76\\\\=(1014-4.76,1014+4.76)\\\\=(1009.24,1018.76)$

Hence, a) (1008.34,1019.658) b) (1009.24,1018.76)

4 0

4 years ago

The length of a rectangle is two more than twice the width. the perimeter is 58ft. what is the area of the rectangle?

goldenfox [79]

58/2 = 29

w +2w+2 = 29

3w+2 =29

3w = 27

w = 27/3 = 9

width = 9

length = 2*9=18+2 = 20

20+20+9+9 = 58

Length = 20 feet

width = 9 feet

5 0

3 years ago

Brainiest if correct or first<br> 1/2(6x+1/2)

Alexxx [7]

Step-by-step explanation:

1/2(6x+1/2)=0

3x+1/4=0

3X=-1/4

X=3(-1/4)

X=-3/4

X=-.75

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3 years ago

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Stretch your thinking rewrite this sentence using the word fewer: Carey reads 10 more pages than Lucey .

Free_Kalibri [48]

Lucy read 10 fewer pages than Carey

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3 years ago

Help? linear equations. when you do it drop your Cashapp !

Diano4ka-milaya [45]

Answer:

5. 8/6x + 2

6. -4x - 2

7. y=3

Step-by-step explanation:

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3 years ago