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2 years ago

I needa pass math q3

Mathematics

1 answer:

beks73 [17]2 years ago

3 0

Answer:

-35h-42

Step-by-step explanation:

Just multiply 7 into the parentheses and you will get the answer

Ask if you have any questions!

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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

How do you write 3/2 as a percentage?

sweet [91]

= 1.5
<span>Move decimal point to right two places, to change into percent </span>
<span>= 150%</span>

4 0

3 years ago

Consider a steel ball floating on the surface of mercury in a half-filled container. What happens when the rest of the container

Helen [10]

Answer

The steel ball will be caught up in between the mercury and water medium.

Step-by-step explanation:

Mercury with a density of 13546 kg/m^3

water with a density of 1000 kg/m^3
Steel with a density of 8050 kg/m^3

From the factual density of both substances given above ,it shows that mercury is more heavier than water. In that case mercury will be at the lower layer when mixed with water.

The steel ball will be caught in between both mixtures as the density of steel is 8050 kg/m^3.Which is more than Water but less than Mercury.

8 0

3 years ago

*Describe the slopes + the y intercepts of the solutions:

blondinia [14]

1. One Solution: Slopes:1 and -1 y-ints:1 and 2

2. Many: Slopes:1 and 1 y-ints:1 and 1

3. Undefined: Slopes:1 and 1 y-ints:1 and 2

Hope Your Thanksgiving Goes Well, Here's A Turkey

-TheKoolKid1O1

3 0

4 years ago

Read 2 more answers

HELP ASAP!! PLS HELP IM BEGGING YOU PLS PLS PLS!! (BRIANLIST)

vampirchik [111]

Answer:

not sure but I think it is no lines of symmetry.

Step-by-step explanation:

the background with trees when folded together don't line up. they aren't similar.

6 0

3 years ago