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3 years ago

A jar contains 6 red, 8 blue, one white, 7 black, and two

Mathematics

1 answer:

kompoz [17]3 years ago

4 0

Answer:

1) 1/23 2) 6/23 3) 2/23 4) 0/23 5) 7/23

Step-by-step explanation:

There are 23 marbles in total.

1) 1/23 There is 1 white marble.

2) 6/23 There are 6 red marbles.

3) 2/23 There are 2 yellow marbles.

4) 0/23 There are 0 purple marbles.

5) 7/23 There are 7 black marbles.

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After calculating the sample size needed to estimate a population proportion to within 0.05, you have been told that the maximum

Svetlanka [38]

Answer: 40000

Step-by-step explanation:

The formula to find the sample size is given by :-

$n=p(1-p)(\dfrac{z_{\alpha/2}}{E})^2$ , where p is the prior estimate of the population proportion.

Here we can see that the sample size is inversely proportion withe square of margin of error.

i.e. $n\ \alpha\ \dfrac{1}{E^2}$

By the equation inverse variation, we have

$n_1E_1^2=n_2E_2^2$

Given : $E_1=0.05$ $n_1=1000$

$E_2=0.025$

Then, we have

$(1000)(0.05)^2=n_2(0.025)^2\\\\\Rightarrow\ 2.5=0.000625n_2\\\\\Rightarrow\ n_2=\dfrac{2.5}{0.000625}=4000$

Hence, the sample size will now have to be 4000.

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2 years ago

Given: ΔABC is a right triangle.

worty [1.4K]

Pythagorean Theorum since that is what you are trying to prove.

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3 years ago

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3+×/2=10 <br> Is ×/2=7<br> And does ×=14

adoni [48]

$3+\dfrac{x}{2}=10\qquad|\text{subtract 3 from both sides}\\\\\dfrac{x}{2}=7\qquad|\text{multiply both sides by 2}\\\\\boxed{x=14}$

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3 years ago

The area of the region under the curve of the function f(x) = 5x + 7 on the interval [1, b] is 88 square units, where b > 1.

djverab [1.8K]

We are given the area of the region under the curve of the function f(x) = 5x + 7 with an interval [1, b] which is 88 square units where b > 1

We need to find the integral of the function f(x) = 5x + 7 with the limits 1 and b

5/2 x^2 + 7x (limits: 1, b)

substitute the limits:

5/2 (1^2) + 7 (1) - 5/2 b^2 + 7b = 0

solve for b

Then after solving for b, this would be your interval input with 1: [1, b].<span />

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2 years ago

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The screen on briannas new phone is 2.85 centimeters long. what mixed number represents the length of the phone screen?

hodyreva [135]

Wait let me think this over

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2 years ago