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Novay_Z [31]
3 years ago
15

I need help plz i donut understand

Mathematics
1 answer:
timama [110]3 years ago
6 0
I donut understand either!
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The percentage of titanium in an alloy used in aerospace castings is measured in 51 randomly selected parts. The sample standard
arlik [135]

Answer: 0.3012

Step-by-step explanation:

The confidence interval for population standard deviation is given by :-

s\sqrt{\dfrac{n-1}{\chi^2_{\alpha/2, n-1}}}

Given : Significance level : \alpha: 1-0.95=0.05

Sample size : n= 51

Sample standard deviation : s=0.36

Then by using the chi-square distribution table, we have

\chi^2_{1-\alpha/2, n-1}}=\chi^2_{0.975, 50}=32.36

\chi^2_{\alpha/2, n-1}}=\chi^2_{0.025, 50}=71.42

Confidence interval for population standard deviation will be :-

(0.36)\sqrt{\dfrac{50}{32.36}}

4 0
3 years ago
A-5/a divided by 4/a
maria [59]

Answer:

\frac{a-5}{4}

Step-by-step explanation:

the given equation is

\frac{a-5}{a} /\frac{4}{a}

from the multiplication rules we know that

\frac{a}{b}/\frac{c}{d}=\frac{a}{b}*\frac{d}{c}

so for the given equation changing the sidn of division to multiplication

the equation becomes

\frac{a-5}{a} * \frac{a}{4}

a cancels out from both numerator and denominator

so it becomes

\frac{a-5}{4}

which is the answer

6 0
3 years ago
What is the slope to this one? Will give brainliest
Mademuasel [1]

Answer:

Negative Slope.

-7/5

Step-by-step explanation:

Decreasing from left to right.

x = 3- -2 = 5

y = -2 - 5 = -7

y = -7/5x + 11/5

7 0
2 years ago
Read 2 more answers
Need help asapppop!!!!!
statuscvo [17]

Answer:

√ 17 , 4.23 , 9/2

Step-by-step explanation:

√ 17 = 4.12310562 ... (about 4.1)

9/2 = 4.5

3 0
3 years ago
Pleaseeee help!!
kkurt [141]

Answer:

answer is A. cosine

Step-by-step explanation:

8 0
3 years ago
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