The distribution of time spent brushing teeth for the 1,200 students in a school is multimodal with a mean of 43 seconds and a standard deviation of 8.99 seconds. If a random sample of 9 students is selected, is it appropriate to calculate the probability of the sample mean being less than 30 seconds using an approximately Normal model? Yes, the population of 1,200 students is reasonably large in size, so the shape of the population is not a concern. Yes, the sample of 1,200 students is a reasonably large sample size, so the shape of the population is not a concern. No, it is not appropriate to estimate the probability using an approximately Normal model because the population is not Normal, and the sample size is small. No, it is not appropriate to estimate the probability using an approximately Normal model because the population is not Normal, but the sample size is reasonably large.

Answer:

it'll be 64:5

Hope this helps

Hope this helps ALL THE BEST!!

Answer:

(a). ST = 15 units; (b). UV = 3 units; (c). [tex]P_{RST}[/tex] = 54 units; (d). SU = 9 units

Step-by-step explanation:

The centroid of a triangle is the intersection of the three median of the triangle.

If a median of a triangle is a perpendicular, then a triangle is an isosceles triangle.

y=9x is proportional

y= 19x - 5 is non proportional.

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Answer:

well 4 is   proportional.  

6 is  non proportinal

Step-by-step explanation:

Answer:

It is 6 inches long

Step-by-step explanation:

Since they are similar the ratio of width and length will be the same for both so the ratio for the first one is 2/3 so whats two thirds of 9? 6, and that's your answer. If you have any questions about this just leave a comment

Answer: it’s the second one

Step-by-step explanation:

Answer:

150%

Step-by-step explanation:

Answer:

Let's find the slope between your two points.

(4,2);(3,0)

Answer:

m=2

Answer:

d)

Step-by-step explanation:

As it always n X n, from first row, there is 1 or 1 X 1, the second row is 4 which is 2 X 2, then keep going, so for nth row, there will be n X n cube.

If it is helpful, plz give me Brainliest.

Answer:

There are 48 boys in the choir

Step-by-step explanation:

Answer:

1) 1.5  2) 0.5

Step-by-step explanation:

To find slope using two points like (x1,y1) and (x2,y2),  the slope is (y2-y1)/(x2-x1), so for first question (7-4)/(5-3) = 3/2 = 1.5, and same for the second question.

Answer:

Scale factor = [tex]\frac{1}{5}[/tex]

Step-by-step explanation:

Formula for the scale factor is,

Scale factor = [tex]\frac{\text{Dimension of the model}}{\text{Dimension of the original}}[/tex]

                    = [tex]\frac{\text{Dimension of the model}}{\text{Dimension of the bridge}}[/tex]

                    = [tex]\frac{\text{Width of the model}}{\text{Width of the bridge}}[/tex]

                    = [tex]\frac{7}{35}[/tex]

                    = [tex]\frac{1}{5}[/tex]

Therefore, scale factor of the model to the real bridge = [tex]\frac{1}{5}[/tex]

Answer:

A

Step-by-step explanation:

Answer:

Step-by-step explanation:you spel't it wrong so if im right then its b and c

8+8

16+16

32+32

Answer:

102 degrees bc it is vertical angle means there's same degree

Answer:

78 degrees

Step-by-step explanation:

because the two lines are parallel and both equal to 180, simply subtract 180 by 102 and you will get your answer :D (edit: I apologize, I didn't read the problem thoroughly. The answer would actually be 102)

Answer:

(1, 1)

Step-by-step explanation:

Answer:

y = 2 x + log ( b x ) , y

Step-by-step explanation:

here you go buddy

Answer:

its going to be option D

Step-by-step explanation:

i promise im right

Answer:

630 is the LCM

Step-by-step explanation:

Prime factorization of the numbers:

30 = 2 × 3 × 5

90 = 2 × 3 × 3 × 5

315 = 3 × 3 × 5 × 7

LCM(30, 90, 315)

= 2 × 3 × 3 × 5 × 7

= 630

hope this helps :)

Answer:

(x+1)²-5(x-7)= area

Area= (x+1)²-5x-35

Area= x²+2x-5x+36

Area= x²-3x+36

Step-by-step explanation:

Answer:

Answer :

5 )

1 - 119

2 - 61

3 - 61

4 - 119

5 - 119

6 - 61

7 - 61

6 )

3 - 102

4 - ??

5 - ??

6 - 133

7 - 47

8 - 47

9 - 133

Step-by-step explanation:

Mark me brainly

===================================================

Explanation:

See the diagram below. It shows there are 10 sides, so n = 10.

We'll plug this value of n into the formula below to find the sum of all ten interior angles

S = sum of interior angles

S = 180(n-2)

S = 180(10-2)

S = 180(8)

S = 1440 degrees

---------------

A different approach:

Let's assume this polygon is a regular polygon. This means each angle is congruent to one another.

We have n = 10 sides, so each exterior angle is E = 360/n = 360/10 = 36 degrees.

Each interior angle adjacent to this 36 degree exterior angle is

180-E = 180-36 = 144 degrees

Since we have 10 equal angles of 144 degrees each, so overall the interior angles add to 10*144 = 1440 degrees

Side note: if this polygon is not a regular polygon, then this section does not apply. You would use the first method instead.

Answer:

<8

Step-by-step explanation:

<1 and <8 are alt exterior angles

Answer:

x=-4

Step-by-step explanation:

5+4x=-11

4x=-11-5

4x=-16

x=-16/4

x=-4

5+4(-4)=-11

5-16=-11

-11=-11

Answer:

x = -4

Step-by-step explanation:

5 + 4x =  -11

4x = -11 - 5

4x = -16 (Divide 4 both sides)

x = -4

5 + 4x =  -11

5 + 4(-4) = -11

5 - 16 = -11

-11 = -11

Answer:

yeah its 93 after being rounded

Step-by-step explanation:

already did it and commented i was just wondering what else there was cause it seemed like there was more.

Answer:

.45

Step-by-step explanation:

Answer:

0.45

Step-by-step explanation:

Since 45 out of the 100 squares are shaded, it means the fraction would be 45/100 and 45/100 is equal to 0.45.

Answer:

t=18/4

or, t= 9/2

simply t = 4.5 or 9/2

Answer:

y=5x-3

Step-by-step explanation:

y=mx+b where m=slope and b= y-intercept

Answer:

what are we helping with?

Step-by-step explanation:

Answer:

4.

A. (-4,4)

B. (0,0)

C. (-5,-2)

Step-by-step explanation:

Answer:

Imagine skip counting by 9

<-------Negative side Positive Side------>

<-36 -27 -18 -9 -0- 9_18_27_36->

Numberline: