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3 years ago

Someone, please help me

Mathematics

1 answer:

kati45 [8]3 years ago

6 0

Answer:

See Attachment

Step-by-step explanation:

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The corner is 60°, and based on the information given it is D...but if you can measure the angle, it would be B... A and C assume different sizes.

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3 years ago

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How to identify the square roots of each term

Yuri [45]

Um where is the question

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3 years ago

Evaluate the expression -3x divided y<br> if x = 10 and y = -3.5

Mumz [18]

The equation is -3x/y
Plug in the numbers given for x and y
-3(10)/-3.5
-30/-3.5
divide and that's your answer

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3 years ago

Perimeter of a square is (12x-2y). What is the algebraic expression for the length of the side of the square?

sashaice [31]

Answer:

s = 3x - (1/2)y

Step-by-step explanation:

The perimeter of a square is 4s, where s is the side length. Here,

12x - 2y = 4s, and so s = 3x - (1/2)y

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3 years ago

We wish to give a 90% confidence interval for the mean value of a normally distributed random variable. We obtain a simple rando

coldgirl [10]

Answer: $(9.27025,\ 11.12975)$

Step-by-step explanation:

Given : Sample size : n= 9

Degree of freedom = df =n-1 =8

Sample mean : $\overline{x}=10.2$

sample standard deviation : $s= 1.5$

Significance level ; $\alpha= 1-0.90=0.10$

Since population standard deviation is not given , so we use t- test.

Using t-distribution table , we have

Critical value = $t_{\alpha/2, df}=t_{0.05 , 8}=1.8595$

Confidence interval for the population mean :

$\overline{x}\pm t_{\alpha/2, df}\dfrac{s}{\sqrt{n}}$

90% confidence interval for the mean value will be :

$10.2\pm (1.8595)\dfrac{1.5}{\sqrt{9}}$

$10.2\pm (1.8595)\dfrac{1.5}{3}$

$10.2\pm (1.8595)(0.5)$

$10.2\pm (0.92975)$

$(10.2-0.92975,\ 10.2+0.92975)$

$(9.27025,\ 11.12975)$

Hence, the 90% confidence interval for the mean value= $(9.27025,\ 11.12975)$

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3 years ago