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3 years ago

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