CAN SOMEBODY HELP ME I AM CONFUSED

Answer: Alex’s times for running a mile are Normally distributed with a mean time of 5.28 minutes and a standard deviation of 0.38 seconds. Chris’s times for running a mile are Normally distributed with a mean time of 5.45 seconds and a standard deviation of 0.2 seconds. Ten of Alex’s times and 15 of Chris’s times are randomly selected. Let x Overbar Subscript Upper A Baseline minus x Overbar Subscript Upper C represent the difference in the mean times for Alex and Chris. Which of the following represents the shape of the sampling distribution for x Overbar Subscript Upper A Baseline minus x Overbar Subscript Upper C?

Normal, because both population distributions are Normal.  

Uniform, because the both sample sizes are less than 30.

Skewed right, because the difference in times cannot be negative.

Skewed left, because the sample sizes are less than 30 and the sampling variability is unknown.

Step-by-step explanation: Can someone tell me the answer?

Skewed left, because the sample sizes are less than 30 and the sampling variability is unknown.

Alex’s times for running a mile are Normally distributed with a mean time of 5.28 minutes and a standard deviation of 0.38 seconds.

Chris’s times for running a mile are Normally distributed with a mean time of 5.45 seconds and a standard deviation of 0.2 seconds.

Ten of Alex’s times and 15 of Chris’s times are randomly selected. Let x Overbar Subscript Upper A Baseline minus x Overbar Subscript Upper C represent the difference in the mean times for Alex and Chris.

The standard deviation is a statistic that measures the dispersion of a dataset relative to its mean and is calculated as the square root of the variance.

Normal, because both population distributions are Normal.  

Uniform, because both sample sizes are less than 30.

Skewed right, because the difference in times cannot be negative.

Skewed left, because the sample sizes are less than 30 and the sampling variability is unknown.

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Answer:

the answer is 0.1882

Answer:

The number of adults tickets sold equals 52.

Step-by-step explanation:

First, we need to establish the system of equations:

x= number of adults tickets sold

y= number of kids tickets sold

10x + 6y= 928

x + y=120

Now, we isolate x in one equation and change it in the other to obtain its value:

x= 120 - y

10(120 - y) + 6y = 928

1,200 - 10y + 6y = 928

272 = 4y

68 = y

x= 120 - 68= 52

Answer:

50 questions.

Step-by-step explanation:

if you divide 100 by 49 you get 2.04 round down, each question is 2 points per question and the student got a 98% then just multiply 49 by 2 just to make sure, then go up. 50 times 2 is 100%, so the answer is 50 questions

Answer:

n = -8

Step-by-step explanation:

Answer:

-8

here's the solution

5(n - 4) = -60

5n - 20 = -60

5n = -60+20

5n = -40

n = -40/5

n= -8

hope it helps

Answer:

4d−3

Step-by-step explanation:

5d−7−d+4

Combine 5d and −d to get 4d.

4d−7+4

Add −7 and 4 to get −3.

4d−3

The simplified expression is 4d - 3.

Given is an expression 5d - 7 - d + 4 we need to simplify it,

We know that,

An expression is a combination of numbers, variables, and operations that can be evaluated to produce a value.

It can represent a mathematical relationship or a computation.

To simplify the expression 5d - 7 - d + 4, we can combine like terms.

First, let's group the terms with the variable "d" together:

(5d - d) - 7 + 4

Simplifying within the parentheses:

4d - 7 + 4

Combining the constants:

4d - 3

Therefore, the simplified expression is 4d - 3.

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Answer:

95

Step-by-step explanation:

Answer:

31.8 that is it I just need to fill a 20 character long answer

Answer:

Awnser is C

Vertex (1, -2), Axis of symmetry is x = 1

Answer:    it took him 9 hours

Answer: 25.52771

Step-by-step explanation:

i got this answer and it was right :D

The required answer would be 25.48271 if 25.48271 increased by 45 thousandths.

Arithmetic operations can also be specified by subtracting, dividing, and multiplying built-in functions. The operator that performs the arithmetic operation is called the arithmetic operator.

+ Addition operation: Adds values on either side of the operator.

For example 12 + 2 = 14

- Subtraction operation: Subtracts the right-hand operand from the left-hand operand.

for example 12 -2 = 10

* Multiplication operation: Multiplies values on either side of the operator

For example 12*2 = 24

We have been given that 25.48271 increased by 45 thousandths.

Therefore, 25.48271 + 45/1000

⇒ 25.48271 + 0.045

⇒ 25.52771

Hence, the required answer would be 25.48271.

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Answer:

Any line with a slope of 3/4, the y intercept could be anything

Step-by-step explanation:

A perpendicular line's equation is the opposite reciprocal

For example if the slope is -3 the perpendicular line's slope would be 1/3

An example of an answer you can put for your problem is :

y=3/4x+1

Answer: -3/4

Step-by-step explanation:

it would be something like this:

f(x) = 12 + x(4%)

but if you want it in y format then:

y = 12 + x(4%)

Answer:

1

Step-by-step explanation:

1+19=20

so only 1 visit is available if they only have $20 to use.

Answer:

1

Step-by-step explanation:

19+1=20

Answer:

Step-by-step explanation:

[tex]\frac{1}{3}[/tex] yessssss sirr

Answer:

Not a function

Step-by-step explanation:

There are two outputs (4 and 6) for one input x. If it were function, y(1) can only be one thing  

Answer:

0

Step-by-step explanation:

9x-18=3(3x-6)

3(3x-6)=9x-18

9x-18=9x-18

9x-9x=0

-18+18=0

Solutions are the values of an equation where the values are substituted in the variables of the equation and make the equality in the equation true.

9x - 18 = 3 (3x - 6)

The equation 9x - 18 = 3 (3x - 6) has infinitely many solutions.

Solutions are the values of an equation where the values are substituted in the variables of the equation and make the equality in the equation true.

Example:

2x + 3 = 5

2 x 1 + 3 = 5

2 + 3 = 5

5 = 5

Where x = 1 is a solution.

We have,

9x - 18 = 3 (3x - 6)

9x - 18 = 9x - 18

Whatever value we put for x we will always get the same in both sides of the equation which means the equation is satisfied.

We see that the equation is equivalent.

This means the equation will have infinitely many solutions.

Thus,

The equation 9x - 18 = 3 (3x - 6) has infinitely many solutions.

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Answer:

a) The percentage change in the combined butterfly and bee population was a decrease of 5%.

b) The butterfly population in January was 210.

Step-by-step explanation:

In January, the ratio of the number of butterflies to the number of bees in a garden was 7 : 3.

This means that:

[tex]\frac{x}{y} = \frac{7}{3}[/tex]

In which x is the number of butterflies and y is the number of bees.

In February, the butterfly population decreased by 20% while the bee population increased by 30%.

This means that:

[tex]\frac{x}{y} = \frac{7*(1-0.2)}{3*(1+0.3)} = \frac{7*0.8}{3*1.3} = \frac{5.6}{3.9}[/tex]

(a) What was the percentage change in the combined butterfly and bee population?

January: 7 + 3 = 10

February: 5.6 + 3.9 = 9.5

Change

[tex]100*\frac{9.5-10}{10} = -\frac{50}{10} = -5[/tex]

This means that the percentage change in the combined butterfly and bee population was a decrease of 5%.

(b) If there were 168 butterflies left in February, what was the butterfly population in January?

February is 80% of January, for the population of butterflies. So

[tex]0.8x = 168[/tex]

[tex]x = \frac{168}{0.8}[/tex]

[tex]x = 210[/tex]

The butterfly population in January was 210.

Answer:

A

Step-by-step explanation:

[tex]\frac{3}{11} = 0.2727272727[/tex]

27 is repeating so you draw a line over the number

Answer: 0.27 thats the answer hope you pass your grade

Answer:

true

Step-by-step explanation:

Answer:

nota entonces jwbsbsbwhe de un 2

Answer:

-3

Step-by-step explanation:

this is x equals to -3

we can divide the 4 to other side

In the given function number of terms is 5.

Polynomials are algebraic formulas with any number of terms joined by addition or subtraction. A term is a number, a variable, or a product of a number and one or more exponentiated variables. Similar words (variables raised to the same power) can be joined to simplify a polynomial.

Given a function f(x) = x4 + 2x3 – 13x2 – 14x + 24 which has 5 Non-Zero coefficients. Therefore the number of terms is 5 in the given Function.

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Answer:

Step-by-step explanation:

so we can use [tex]t^{2}[/tex] + 25  as one expression and the find the distance between the points and set the expression equal to that number.  That's our strategy.

dist = the square root  of [tex]x^{2}[/tex]  + [tex]y^{2}[/tex]  

where x and y are the change in x2 to x1 and y2 to y1

P1 = ( -3, -5)

P2 = (2, 7 )

dist = square root of (  [2 -(-3) ]^2  + [7-(-5)]2)

dist = sq rt  ( 5^2 + 12^2 )

dist = sq rt ( 25 + 144)

dist = sq rt (169)

dist = 13

now set our eq.  equal to that number

[tex]t^{2}[/tex] + 25 = 13

[tex]t^{2}[/tex] = -12

this is looking kinda bad, do you know complex numbers?

t = 0 + j 3.46410

hmmm  I'm wondering if you've  left out .. or forgotten some thing in the question?   :/