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3 years ago

What percent is 25 of 100?

Mathematics

1 answer:

Aleksandr [31]3 years ago

4 0

The correct percent would be 25%. Hope this helps! :) Pls mark me Brainliest!!!

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An experiment was performed to compare the abrasive wear of two different laminated materials. Twelve pieces of material 1 were

vladimir1956 [14]

Answer:

The calculated value Z= 4.8389> 1.96 at 0.05 level of significance.

The null hypothesis is rejected.

There is significance difference between that the abrasive wear of material 1 not exceeds that of material 2 by more than 2 units

Step-by-step explanation:

Step:-(1)

Given data the samples of material 1 gave an average (coded) wear of 85 units with a sample standard deviation of 4

Mean of the first sample x₁⁻ =85

standard deviation of the first sample S₁ = 4

Given data the samples of material 2 gave an average of 81 and a sample standard deviation of 5.

Mean of the first sample x₂⁻ =81

standard deviation of the first sample S₂ = 5

Step :-2

Null hypothesis: H₀: there is no significance difference between that the abrasive wear of material 1 exceeds that of material 2 by more than 2 units

Alternative hypothesis :H₁: there is significance difference between that the abrasive wear of material 1 exceeds that of material 2 by more than 2 units

Assume the populations to be approximately normal with equal variances.σ₁² =σ₂²

The test statistic

$Z= \frac{x_{1} -x_{2} }{\sqrt{\frac{S^2_{1} }{n_{1} } +\frac{S^2_{2} }{n_{2} } } }$

Given n₁=n₂=60.

$Z= \frac{85-81 }{\sqrt{\frac{(4)^2 }{60 } +\frac{5^2 }{60} } }$

On calculation, we get

Z = $\frac{4}{\sqrt{0.6833} }$

z = 4.8389

The tabulated value Z =1.96 at 0.05 level of significance.

The calculated value Z= 4.8389> 1.96 at 0.05 level of significance.

The null hypothesis is rejected.

Conclusion:-

there is significance difference between that the abrasive wear of material 1 not exceeds that of material 2 by more than 2 units.

3 0

3 years ago

Vertex of an angel?? don't know definition

aksik [14]

A vertex is the common point that two lines or rays diverge from.

8 0

3 years ago

How is the process of rewriting literal equations similar to the process of solving equations in one variable? How is it differe

Scilla [17]

U don't answer the question just leave it

8 0

3 years ago

9) Simplify 5^12 ÷ 5^3 A. 5^4 B. 5^9 C. 1^4 D. 1^9

Mashcka [7]

When you divide powers, you subtract them.

12-3=9

B. 5^9 is the answer.

I hope this helps!
~kaikers

5 0

3 years ago

Which statement is correct?

fenix001 [56]

The correct statement is the third figure, that is:

$\frac{3.56 \times 10^2}{1.09 \times 10^4} > (4.08 \times 10^2)(1.95 \times 10^{-6})$

To prove this, we need to solve each side of the inequality and see that, in fact, the term on the left side is greater than the term on the right. So:

$\frac{356}{10900} \ \textgreater \ (408)(1.95 \times 10^{-6}) \\ \\ 0.032 \ \textgreater \ 7.956 \times 10^{-4} \\ \\ \boxed{0.032 \ \textgreater \ 0.0007956}$

As you can see 0.032 is greater than 0.0007956, so this is the only answer that is true. The rest of the choices are false! Recall that Inequality tells us about the relative size of two values. Inequality refers the term greater or less than (this may include or not the equality)

4 0

4 years ago