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3 years ago

7

What is the value of the reciprocal of 1.6? 15 points

1 answer:

Marysya12 [62]3 years ago

3 0

Answer:

0.625.

Step-by-step explanation:

The reciprocal of a is 1/a.

So here the answer is 1/ 1.6

= 0.625.

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What is the standard deviation of a sampling distribution called?

GarryVolchara [31]

Answer: Standard error.

Step-by-step explanation:

If the population is normally distributed , then the standard deviation of a sampling distribution of the sample mean $[tex]\overline{x}$ [/tex] is known as standard error which depends on population standard deviation $(\sigma)$ and the sample size (n).

$\sigma_x=\dfrac{\sigma}{\sqrt{n}}$

It measure the variability in the sample statistics that happens by chance.

Thus, the standard deviation of a sampling distribution is called the <u>standard error</u>.

8 0

3 years ago

15 points for answers 10,11,12

AysviL [449]

Answer:

#10=6 #11=90 #12=-10

Step-by-step explanation:

15-9=6

59+31=90

5+2-y=-3

7-y=-3

7-10=-3

5 0

4 years ago

Please help and help me on the first one too idk if I got that correct or not

inessss [21]

Answer:

14, 12

Step-by-step explanation:

the first is right I think

r+p=28 can also be written as 28-p=r

so 28-14=14

and 28-16=12

hopefully that works

5 0

3 years ago

The sum of 30 times (1/3)^(n-1) from 1 to infinity

sergeinik [125]

Let

$S_n=\displaystyle1+\frac13+\frac1{3^2}+\cdots+\frac1{3^n}$

Then

$\dfrac13S_n=\displaystyle\frac13+\frac1{3^2}+\frac1{3^3}+\cdots+\frac1{3^{n+1}}$

and

$S_n-\dfrac13S_n=\dfrac23S_n=1-\dfrac1{3^{n+1}}\implies S_n=\dfrac32-\dfrac1{2\cdot3^n}$

and as $n\to\infty$ , we end up with

$\displaystyle\lim_{n\to\infty}S_n=\lim_{n\to\infty}\sum_{i=1}^{n+1}\frac1{3^{i-1}}=\lim_{n\to\infty}\left(\frac32-\frac1{2\cdot3^n}\right)=\frac32$

So we have

$\displaystyle\sum_{n=1}^\infty30\left(\frac13\right)^{n-1}=30\cdot\frac32=45$

8 0

3 years ago

Mary had five and one-half dollars. She spent tw wo and one-fourth dollars on a snack. How much money does Mary have left?

Levart [38]

5/1-1/4=4/3 i thinkkkkkkkkkk so

7 0

4 years ago