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3 years ago

20 points NEED HELP

2 answers:

8 0

It would be C, because there are 700,000 people and with A, B, and D there are more people than there are the original population.

Mamont248 [21]3 years ago

8 0

Answer:

the answer is C

Step-by-step explanation:

hope this helps

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ASAP<br> Can someone help me with this please

Sidana [21]

Answer:

x = 2

Step-by-step explanation:

3 0

3 years ago

Read 2 more answers

an urn contains 10 blue marbles and 8 yellow marbles a marble is drawn and dropped back into the urn. Then a second marble is dr

Sunny_sXe [5.5K]

Answer:

80/729

Step-by-step explanation:

8/18x8/18x10/18=640/5832

80/729

6 0

3 years ago

If a light bulb manufacturing company wants to estimate, with 99% confidence, the mean life of compact fluorescent light bulb

Reptile [31]

Answer:

We need at least 217 compact fluorescent light bulbs

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1-0.99}{2} = 0.005$

Now, we have to find z in the Ztable as such z has a pvalue of $1-\alpha$ .

So it is z with a pvalue of $1-0.005 = 0.995$ , so $z = 2.575$

Now, find M as such

$M = z*\frac{\sigma}{\sqrt{n}}$

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

How many compact fluorescent light bulbs need to be selected?

We need at least n bulbs, in which n is found when $M = 175, \sigma = 1000$

$M = z*\frac{\sigma}{\sqrt{n}}$

$175 = 2.575*\frac{1000}{\sqrt{n}}$

$175\sqrt{n} = 2575$

$\sqrt{n} = \frac{2575}{175}$

$\sqrt{n} = 14.71$

$\sqrt{n}^{2} = (14.71)^{2}$

$n = 216.5$

We need at least 217 compact fluorescent light bulbs

4 0

3 years ago

Read 2 more answers

Can an expert help me out with this please.step by step explanation..Ill give brainless and points

GenaCL600 [577]

5/35 so 1/7 as a decimal this is .143. This is because it says D OR F which means add them and divide by 35. So your answer is 0.143

6 0

3 years ago

Which expressions are equivalent to the expression 32 ÷ (8 – 4)? Choose exactly two answers that are correct. A. 18 – 2 ÷ 2 B. 4

kap26 [50]

$32 \div (8-4)=32 \div 4=8 \\ \\
A. \\
18-2 \div 2=18-1=17 \\ \\
B. \\
48 \div (10-4) = 48 \div 6=8 \\ \\
C. \\
15-21 \div 3=15-7=8 \\ \\
D. \\
36 - 15 \div 3 +1=36 - 5+1=31+1=32$

B and C are equivalent to the expression.

3 0

3 years ago