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Gnesinka [82]
3 years ago
10

Find the value of x. A. 60 B. 40 C. 30 D. 50

Mathematics
2 answers:
scZoUnD [109]3 years ago
6 0

the answer to the question is choice A

AVprozaik [17]3 years ago
4 0
Do you have the equation needed to solve for x?
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The manufacturer of the ColorSmart-5000 television set claims 95 percent of its sets last at least five years without needing a
patriot [66]

Answer:

Step-by-step explanation:

Hello!

Your study variable is X: "number of ColorSmart-5000 that didn't need repairs after 5 years of use, in a sample of 390"

X~Bi (n;ρ)

ρ: population proportion of ColorSmart-5000 that didn't need repairs after 5 years of use. ρ = 0.95

n= 390

x= 303

sample proportion ^ρ: x/n = 303/390 = 0.776 ≅ 0.78

Applying the Central Limit Theorem you approximate the distribution of the sample proportion to normal to obtain the statistic to use.

You are asked to estimate the population proportion of televisions that didn't require repairs with a confidence interval, the formula is:

^ρ±Z_{1-\alpha /2}* √[(^ρ(1-^ρ))/n]

Z_{1-\alpha /2} = Z_{0.995} = 2.58

0.78±2.58* √[(0.78(1-0.78))/390]

0.0541

[0.726;0.834]

With a confidence level of 99% you'd expect that the interval [0.726;0.834] contains the true value of the proportion of ColorSmart-5000 that didn't need repairs after 5 years of use.

I hope it helps!

7 0
3 years ago
Peony mixes red paint and white paint in the ratio 1:3 She uses four tins of red paint Work out the total number of tins of pain
blsea [12.9K]

Answer:

16

Step-by-step explanation:

4x3=12 tins of white paint

12+4=16 total tins

5 0
3 years ago
Based only on the information given in the diagram, which congruence
Cloud [144]

Answer:

It has been a while. I think it is ASA and AAS

8 0
1 year ago
Help me please,Thanks
Solnce55 [7]
Download photo math rate 5 <3
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3 years ago
What is the greatest common factor of 18 54 and 72?
FrozenT [24]
I hope this helps you

3 0
3 years ago
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