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3 years ago

Please please help me solve

Mathematics

2 answers:

mash [69]3 years ago

5 0

(2,4) is the only possible answer because it is the only one in the shaded area

lana [24]3 years ago

3 0

(2,4) is the only possible answer because it is the only one in the shaded area

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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

3 years ago

Please help! *Math (10 pts)*

Allisa [31]

It's linear

If you evaluate x when it's 0 you'll get the cut in y, that means the function will pass on (0,7)

The formula for linear functions is y=mx +b

In this case b is 7

M=7-5/0+1

M=2

Now you just write the function down, it would be

F(x) =2x + 7

6 0

3 years ago

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Which statement is true?

Lera25 [3.4K]

Answer:

C is true as 2 pionts = a line

Step-by-step explanation:

I'm smartest in my class

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2 years ago

2 3 2/15+ 5 2 8/15+ 1 6 1/15=

allsm [11]

Answer:

91 11/15

Step-by-step explanation:

23+2/15+52+8/15+16+1/15

=23+52+16+2/15+8/15+1/15

=91+11/15

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3 years ago

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WILL GIVE A BRAINLEST What is the value of [-1.1] –2 –1 0 1

liubo4ka [24]

1.1 isnt an option si believe the answer is 1. hope this helps.

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3 years ago

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