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2 years ago

An anion with a -2 charge is found in which Group?

Mathematics

2 answers:

IgorLugansk [536]2 years ago

5 0

Answer:

A and B any atom or group or atoms with a negative charge

Karolina [17]2 years ago

5 0

A and b with negatives

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A random sample of 10 parking meters in a beach community showed the following incomes for a day. Assume the incomes are normall

Vlad1618 [11]

Answer: (2.54,6.86)

Step-by-step explanation:

Given : A random sample of 10 parking meters in a beach community showed the following incomes for a day.

We assume the incomes are normally distributed.

Mean income : $\mu=\dfrac{\sum^{10}_{i=1}x_i}{n}=\dfrac{47}{10}=4.7$

Standard deviation : $\sigma=\sqrt{\dfrac{\sum^{10}_{i=1}{(x_i-\mu)^2}}{n}}$

$=\sqrt{\dfrac{(1.1)^2+(0.2)^2+(1.9)^2+(1.6)^2+(2.1)^2+(0.5)^2+(2.05)^2+(0.45)^2+(3.3)^2+(1.7)^2}{10}}$

$=\dfrac{30.265}{10}=3.0265$

The confidence interval for the population mean (for sample size <30) is given by :-

$\mu\ \pm t_{n-1, \alpha/2}\times\dfrac{\sigma}{\sqrt{n}}$

Given significance level : $\alpha=1-0.95=0.05$

Critical value : $t_{n-1,\alpha/2}=t_{9,0.025}=2.262$

We assume that the population is normally distributed.

Now, the 95% confidence interval for the true mean will be :-

$4.7\ \pm\ 2.262\times\dfrac{3.0265}{\sqrt{10}} \\\\\approx4.7\pm2.16=(4.7-2.16\ ,\ 4.7+2.16)=(2.54,\ 6.86)$

Hence, 95% confidence interval for the true mean= (2.54,6.86)

7 0

3 years ago

In an office, the number of male workers is 3 times greater than female workers. If there are 60 female workers, how many male w

madreJ [45]

Hi, the answer is 180, because 60 *3 = 180

5 0

3 years ago

Someone please help I don’t understand sad face

Bess [88]

-1 cus its -1 becus u -1 so u get -1

6 0

2 years ago

Read 2 more answers

I need help on this problem. Solve for c

DanielleElmas [232]

First you need to multiply each side by 2

X - C. X - C = d * 2
-------- = d --->
2
Then add X from each side

C = d * 2 + X

8 0

2 years ago

Read 2 more answers

4 + 3r - 5r = -4r + 4

ioda

Answer:

r= 0

Step-by-step explanation:

Cancel equal terms on both sides of the equation:

= 3r - 5r = -4r

collect like terms

= -2r = -4r

move variable to left and change its sign

= -2r + 4r = 0

collect like terms

= 2r = 0

divide both sides of the equation by 2

r=0

7 0

3 years ago

Read 2 more answers