All categories

3 years ago

4. Ideal amount of children

Mathematics

1 answer:

Vaselesa [24]3 years ago

3 0

Answer:

Step-by-step explanation:

Formula:

$\frac{sum of all numbers added together}{total amount of numbers}$

$\frac{21}{7}$ = 3

You might be interested in

What is the equation of the line that is perpendicular to the given line and passes through the point (5,3)

Pani-rosa [81]

perpendicular lines have a slope that is a negative reciprocal

A) 4x-5y=5

subtract 4x

solve for y

-5y = -4x+5

divide by -5

y = 4/5 x+5 slope is 4/5 perpendicular slope is -5/4

y -y1 =m(x-x1) point slope form of a line

y-3 = -5/4 (x-5)

B) 5x+4y = 37

subtract 5x

4y =-5x +37

divide by 4

y =-5/4 x +37/4 slope is -5/4 perpendicular slope is 4/5

y -y1 =m(x-x1) point slope form of a line

y-3 = 4/5 (x-5)

C)4x+5y=5

subtract 4x

5y = -4x +5

divide by 5

y = -4/5 x +1

y =-4/5 x +1 slope is -4/5 perpendicular slope is 5/4

y -y1 =m(x-x1) point slope form of a line

y-3 = 5/4 (x-5)

D)5x-4y=8

subtract 5x

-4y = -5x+8

divide by -4

y = 5/4 x-2

y =5/4 x +-2 slope is 5/4 perpendicular slope is -4/5

y -y1 =m(x-x1) point slope form of a line

y-3 = -4/5 (x-5)

6 0

3 years ago

Brainliest to right answer...

satela [25.4K]

the slope is -2

have a nice day :D

8 0

3 years ago

How many groups of 2/3 are in 3/5

amid [387]

To find the answer, we will need to divide 3/5 by 2/3.

3/5 / 2/3

3/5 x 3/2

9 / 10

There are 9/10 groups of 2/3 in 3/5.

Hope this helps!! :)

5 0

2 years ago

Which circles have a circumference of 18pi units?

timurjin [86]

It's A and C, I've taken a test that has this question and it was correct when I answered this, so A and C is your answer.

3 0

3 years ago

The latest poll from ESPN asked fans what their favorite sport was, considering pro, college and highschool levels. Out of 1000

shepuryov [24]

Answer:

Confidence interval is $0.2911$

Step-by-step explanation:

Given that 32% of fans sport is basketball as favorite sport. So total number of fans is,

$32\%\times 1000$

$= \dfrac{32}{100}\times 1000$

$=320$

So 320 fans favorite sport is basket ball.

Now find sample proportion ,

$\widehat{p}=\dfrac{number\:of\:people\:in\:the\:sample}{total\:number\:of\:people}$

Substituting the value,

$\widehat{p}=\dfrac{320}{1000}$

$\widehat{p}=0.320$

Formula for confidence interval is,

$CI=\widehat{p}\pm z\sqrt{\dfrac{\widehat{p}\left (1-\widehat{p}\right )}{n}}$

To calculate the z value.

$Confidence Level=1-\alpha$

$0.95=1-\alpha$

$0.05=\alpha$

Now divide above value by 2,

$\dfrac{0.05}{2}=\dfrac{\alpha}{2}$

$0.025=\dfrac{\alpha}{2}$

To find the value of z score calculate the area under the curve as follows

$A=\dfrac{1+CL}{2}$

$A=\dfrac{1+0.95}{2}$

$A=\dfrac{1.95}{2}$

$A=0.975$

On z table, find the value of 0.975. So the row corresponding to 0.975 is 1.9 and column corresponding to 0.975 is 0.06. Adding these two values the z score is 1.96.

or find the value from excel by using command as follows,

=NORM.S.INV(0.025)= -1.959963985

Now substituting the value,

$CI=0.320\pm 1.96\sqrt{\dfrac{0.320\left (1-0.320\right )}{1000}}$

$CI=0.320\pm 0.02891$

Lower end of the interval is,

$CI=0.320- 0.02891$

$CI=0.2911$

Upper end of the interval is,

$CI=0.320+ 0.02891$

$CI=0.3489$

Therefore 95% confidence interval is $0.2911$

7 0

3 years ago