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3 years ago

I NEED THIS QUICKLY BCUZ ITS A TIMED TEST

Mathematics

1 answer:

GuDViN [60]3 years ago

4 0

Answer:

Repeating decimals are rational, the square root of 1/8 is not rational, 19/5 is rational, square root of 12 is not rational, the decimal is rational, square root of 49 is rational, and sqaure root of 4/25 is rational.

Step-by-step explanation:

Sorry if some of this is wrong :(

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10.

Kay [80]

Answer:

$\frac{(82)(2.4)^2}{104.139} \leq \sigma^2 \leq \frac{(82)(2.4)^2}{62.132}$

$4.535 \leq \sigma^2 \leq 7.602$

Now we just take square root on both sides of the interval and we got:

$2.2 \leq \sigma \leq 2.8$

And the best option would be:

A. 2.2 < σ < 2.8

Step-by-step explanation:

Information provided

$\bar X=32.1$ represent the sample mean

$\mu$ population mean

s=2.4 represent the sample standard deviation

n=83 represent the sample size

Confidence interval

The confidence interval for the population variance is given by the following formula:

$\frac{(n-1)s^2}{\chi^2_{\alpha/2}} \leq \sigma^2 \leq \frac{(n-1)s^2}{\chi^2_{1-\alpha/2}}$

The degrees of freedom are given by:

$df=n-1=83-1=82$

The Confidence is given by 0.90 or 90%, the value of $\alpha=0.1$ and $\alpha/2 =0.05$ , the critical values for this case are:

$\chi^2_{\alpha/2}=62.132$

$\chi^2_{1- \alpha/2}=104.139$

And replacing into the formula for the interval we got:

$\frac{(82)(2.4)^2}{104.139} \leq \sigma^2 \leq \frac{(82)(2.4)^2}{62.132}$

$4.535 \leq \sigma^2 \leq 7.602$

Now we just take square root on both sides of the interval and we got:

$2.2 \leq \sigma \leq 2.8$

And the best option would be:

A. 2.2 < σ < 2.8

3 0

3 years ago

2/3 x 4/5? or any other way of solving this

Kazeer [188]

You have to make the bottoms numbers the same (15) 3x5=15 5x3=15 so the answer is 8/15

6 0

3 years ago

Deshawn is serving ice cream with the birthday cake at his party.He has purchased 19 1/2 pints of ice cream. He will serve 3/4 o

soldier1979 [14.2K]

26 and no there will not be any left

8 0

3 years ago

In Ms. Smith's class, the ratio of students that walk to school to students that take the subway is 1:2. The ratio of students t

algol13

Let y and z be the no. of students that walk to school, that takes the subway and that takes the bus

We have,
3/y = 1/2
=> y = 6 --- (1)

and,
y/z = 1/3
=> y/z = 1/3 [from (1)]
=> z = 18
Hence the no. of students that takes the bus are 18 students

7 0

3 years ago

Read 2 more answers

My sister got stuck on these :<<br> Can you tell me the answers?‍♀️

Zigmanuir [339]

Answer:

Below

Step-by-step explanation:

First she needs to estimate or guess what length they may be, like say the eraser is 2 1/2 inches, she then can use a ruler on the paper to get the actual length.

6 0

3 years ago