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jenyasd209 [6]
3 years ago
12

Help again but not the last question.

Mathematics
1 answer:
daser333 [38]3 years ago
8 0
1).2:5
2). If pan has 40 dollars in her account that means her brother has 100 dollars since all your doing is 20×2=40 20×5=100
3). Im not sure about this one but I assume it is 4:10
(I dont know what a tape diagram is but I hope this helped).
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Find the minimum sample size necessary to be 99% confident that the population mean is within 3 units of the sample mean given t
olga55 [171]

Answer:

623

Step-by-step explanation:

Given that margin of error (E) = 3 unit, standard deviation (σ) = 29, sample size (n) = ?

a) The confidence (C) = 99% = 0.99

α = 1 - C = 1 - 0.99 = 0.01

α/2 = 0.01 / 2 = 0.005

From the normal distribution table, The z score of α/2 (0.005) is the critical value and it corresponds to the z score 0.495 (0.5 - 0.005) which is 2.58.

critical\ value = z_{\frac{\alpha}{2} }=z_{0.005}=2.58\\

b) The margin of error (E) is given as:

<h3>E=z_{\frac{\alpha}{2} }*\frac{\sigma}{\sqrt{n} }\\\\\sqrt{n}= z_{\frac{\alpha}{2} }*\frac{\sigma}{E }\\ \\n=( z_{\frac{\alpha}{2} }*\frac{\sigma}{E })^2\\\\Substituting:\\\\n=(2.58*\frac{29}{3} )^2=622.0036\\\\\\n=623(to\ the \ next\ whole\ number)</h3>

The minimum sample size (n) is 623

3 0
4 years ago
Eighteen more than double a number is 8 <br> please help due tonight
GenaCL600 [577]

Answer

-9

Step-by-step explanation:

let the number be x

the equation is 2x+18=8

x=-9

7 0
3 years ago
Read 2 more answers
Dee lives in Michigan, which has a state income tax rate of 4.35%. She earns $2,200 per week.
babymother [125]

answer is $4,976.40

example  $2,200 x 0.0435 x 52 = $4, 976.40

5 0
2 years ago
Based on one of the triangle congruence postulates the two triangles shown are congruent​
Semenov [28]

Answer:  b) FALSE

<u>Step-by-step explanation:</u>

In order to show triangle congruency, you must be able to prove one of the following theorems:

SAS: Side-Angle-Side

SSS: Side-Side-Side

AAS: Angle -Angle-Side

ASA: Angle-Side-Angle

HL: Hypotenuse-Leg   <em>(can only be used for right triangles)</em>

<em />

We are only given information about two of the sides being congruent but no information on the third side or any of the angles so we canNOT prove the triangles are congruent.

7 0
4 years ago
4 1/6 pounds of rice is divided into 5 equal portions. What is the weight in pounds of each portion?
Katen [24]
5/6 or 0.83 lbs is the anwser
4 0
3 years ago
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