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Fantom [35]
3 years ago
6

How to do 8,752-3,269​

Mathematics
1 answer:
matrenka [14]3 years ago
8 0
8752
-3269
———
5483. You subtract
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The LB Company has long manufactured a light bulb with an average life of 5400 hours. Company researchers have recently develope
elena55 [62]
<h2><u>Answer with explanation</u>:</h2>

Let \mu be the average life of light bulbs.

As per given , we have

Null hypothesis : H_0 : \mu =5400

Alternative hypothesis : H_a : \mu >5400

Since H_a is right-tailed and population standard deviation is also known, so we perform right-tailed z-test.

Formula for Test statistic : z=\dfrac{\overlien{x}-\mu}{\dfrac{\sigma}{\sqrt{n}}}

where, n= sample size

\overline{x}= sample mean

\mu= Population mean

\sigma=population standard deviation

For n=95,\ \overline{x}=5483\ \&\ \sigma=500, we have

z=\dfrac{5483-5400}{\dfrac{500}{\sqrt{95}}}=1.61796786124\approx1.6180

Using z-value table , Critical one-tailed test value for 0.06 significance level :

z_{0.06}=1.5548

 Decision : Since critical z value (1.5548) < test statistic (1.6180), so we reject the null hypothesis .

[We reject the null hypothesis when critical value is less than the test statistic value .]

Conclusion : We have enough evidence at 0.06 significance level to support the claim that the new filament yields a longer bulb life

8 0
3 years ago
What is 1/6 as a percentage
erica [24]
Just take 1 divided by 6
1/6=0.16666667
4 0
3 years ago
Read 2 more answers
Identify as indicating a linear function or quadratic function. f (x) = ax^2 + bx +c <br>​
NemiM [27]
I’m 99% sure It is a quadratic function
7 0
3 years ago
How to solve 2/3(6x-9)=-34
castortr0y [4]
\frac{2}{3} (6x-9)=-34 \\ \\  \frac{2(6x - 9)}{3} =-34 \\ \\  \frac{2 \times 3(2x-3)}{3} =-34 \\ \\  \frac{6(2x - 3)}{3} = -34 \\ \\ 2(2x - 3) = -34 \\ \\ 2x - 3 - \frac{34}{2} \\ \\ 2x - 3 = -17 \\ \\ 2x -17 + 3 \\ \\ 2x = -14 \\ \\ x = - \frac{14}{2} \\ \\ x = -7 \\ \\ Answer: \fbox {x = -7}
5 0
3 years ago
Brenda is cooking couscous. The recipe says she requires 480 grams of couscous for 4 people. How many will she need for 14?
alexgriva [62]

Answer:

1,680\ g

Step-by-step explanation:

we know that

Brenda requires 480 grams of couscous for 4 people

so

using proportion

Find out how many grams of couscous she requires for 14 people

Let

x -----> the amount of grams

\frac{480}{4}\frac{g}{people}=\frac{x}{14}\frac{g}{people} \\\\x=14*480/4\\\\x=1,680\ g

4 0
3 years ago
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