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Zepler [3.9K]
3 years ago
11

Can somebody please help, i'll mark you as brainiest and no links:)​

Mathematics
2 answers:
Step2247 [10]3 years ago
8 0

Answer:

28

Step-by-step explanation:

The formula for the area of the shape is given is equal to its base multiplied by its height. We're given a base of 7 and height of 4, hence the area is 7\cdot 4=\boxed{28}

Naily [24]3 years ago
8 0
It’s the fourth option
28!
Hope this helps
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For example( and this is straight from the paper), "15 people in 3 equal rows."
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what transformation was not done to the linear parent function f(x) to get the function (x)=-3(x+4)-7
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Lifetimes of AAA batteries are approximately normally distributed. A manufacturer wants to estimate the standard deviation of th
AURORKA [14]

Answer:

95% confidence interval for the population standard deviation of the lifetimes of the batteries produced by the manufacturer.

(8.889, 11.7106)

Step-by-step explanation:

<u><em>Step(i)</em></u>:-

Given sample size 'n' = 23

Mean of the sample x⁻ = 10.3

Standard deviation of the sample (s) = 2.4

Level of significance = 0.05

Degrees of freedom = n-1 = 23-1 =22

<u><em>Step(ii)</em></u>:-

95% confidence interval for the population standard deviation of the lifetimes of the batteries produced by the manufacturer.

(x^{-} - t_{\frac{\alpha }{2}  } \frac{S}{\sqrt{n} } , x^{-} +t_{\frac{\alpha }{2}  } \frac{S}{\sqrt{n} } )

(10.3 - t_{\frac{0.05}{2}  } \frac{2.4}{\sqrt{23} } , 10.3 +t_{\frac{0.05}{2}  } \frac{2.4}{\sqrt{23} } )

(10.3 -  2.8188 (0.50043) , 10.3 + 2.8188(0.50043)

(10.3-1.4106 , 10.3+1.4106)

(8.889, 11.7106)

<u><em>final answer</em></u>:-

95% confidence interval for the population standard deviation of the lifetimes of the batteries produced by the manufacturer.

(8.889, 11.7106)

8 0
3 years ago
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