Write a proportion to find how many points x a student needs to score on a test worth 50 points to get a test score of 78%.

Answer:

Step-by-step explanation:

Given that:

The population mean μ = 900

The sample size n = 53

The sample mean = 841

The standard deviation = 190

The level of significance = 0.01

To test the claim that the mean balance of the accounts has decreased during the period.

The null and the alternative hypothesis can be computed as:

[tex]H_o : \mu \ge 900 \\ \\ H_1 : \mu < 900[/tex]

This is a left-tailed test since the alternative is less than 900

The test statistics can be computed as:

[tex]Z = \dfrac{\overline x - \mu}{\dfrac{s}{\sqrt{n}} }[/tex]

[tex]Z = \dfrac{841 -900}{\dfrac{190}{\sqrt{53}} }[/tex]

[tex]Z = \dfrac{-59}{\dfrac{190}{7.28}}[/tex]

Z = -2.26

The p-value = P(Z < -2.26)

From the z-tables

The p-value = 0.01191

The p-value ≅ 0.012

Decision rule: To reject the null hypothesis if the significance level is > p-value.

We failed to reject the null hypothesis.

Conclusion: Thus, there is insufficient evidence to conclude that such accounts mean balance has decreased during this period.

Answer:

D. just sub x = 1, and if the y you get is 5 then that's the answer

Answer:

False

Step-by-step explanation:

Energy stored in an object is potential energy but energy in motion is kinetic energy  

Answer:

the x intersept is 3 the y intercept is 4

Step-by-step explanation:

x intersept : 24/8 = 3

y intersept : 24/6 =4

Answer:

-7

Step-by-step explanation:

−10−(−3)

=−10−(−3)

=−10+3

=−7

Answer:

-7

you're welcome

Answer:

Wait lemme think

Step-by-step explanation:

7.7 divided by 1.4 = 5.5. So the flagpole is 5.5 times taller than meter stick

Thus flagpole is 5.5 m tall.

Answer:

18 1/2

Step-by-step explanation:

3 7/10 x 5 = 18 1/2

Answer: D. 1/2x - 3

Hope this helps :)

Answer:

5/8

Step-by-step explanation:

To find the reciprocal, flip the fraction. The sign remains the same.

The reciprocal of 8/5 is 5/8.

Answer: 5/8

Answer:

D

Step-by-step explanation:

Answer:

am confused

Step-by-step explanation:

Step-by-step explanation:

sorry Im not sure what the question is

Answer:

the values of N for which there will be no spectral leakage are;

N = Integers multiple by 8

Step-by-step explanation:

Given that;

discrete-time sinusoidal segment x[n] = 6.2cos(0.75πn + 1)

Using DFT to compute the spectrum

The spectral leakage will not be present in the spectrum if the product f₀Td is an integer.

Here, f₀ is sinusoid's frequency and Td is the segment duration

Now we calculate the period of the signal

2π/ω = 2π/0.75π

ω =  2 / 0.75

( × 4 )

ω =  8 / 3

Here, the numerator value is the period of the signal

T₀ = 8

The spectral leakage will not be present in the spectrum if N is  the Integer multiple of period T₀.

Therefore, the values of N for which there will be no spectral leakage are;

N = Integers multiple by 8

Step-by-step explanation:

-5=q+2

-5+2=q

q= -3

hope it helps.

Answer:

q = -7

Step-by-step explanation:

q+2=-5

subtract 2 from both sides

q+2-2=-5-2

q+0=-7

q=-7

Hope this helps. Have a nice day. May it be filled with joy and happiness. Please, stay safe and wash your hands. Happy Holidays.

Answer:

40

Step-by-step explanation:

16 is 40 percent that means that :

32 is 80 percent

8 is 20 percent.

32 + 8 is 40 ------  80 percent+ 20 percent =100 percent

40 is the number whose 40% is 16.

percentage, a relative value indicating hundredth parts of any quantity.

We need to find the number whose 40% is 16.

Let us consider the number be x.

Convert 40% to the decimal by dividing with 100

40/100=0.4

Now multiply zero point four with x which gives 16

0.4x=16

Divide both sides by 0.4

x=16/0.4

x=40

Hence, 40 is the number whose 40% is 16.

To learn more on Percentage click:

https://brainly.com/question/28269290

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Answer:

idek

Step-by-step explanation:

Answer:

Step-by-step explanation:

12 3/8

Answer:

100%-15%=85%

She used 85% of the total oil for last month

So 6gallons × 85 ÷ 100 = 5.1 gal

Answer:

520

Step-by-step explanation:

Given that:

Profit function p(x) is :

P(x) = 8.50x- 1500

If the profit made = $2920 ; the number of pizza kits sold is :

Then p(x) = 2920

Putting p(x) = 2920 in the equation :

2920 = 8.50x - 1500

2920 + 1500 = 8.50x

4420 = 8.50x

Divide both sides by 8.50

4420 / 8.50 = 8.50x / 8.50

520 = x

Hence, number of pizza kits sold is 520

Answer:

Step-by-step explanation:

569

Step-by-step explanation:

In a parallelogram, opposite sides are equal.

Hence 3x = 6 and x = 2.

Answer for the first equation:

(7, -1)

Step-by-step explanation:

Original Equation: 5(x - 3y) - 2x = 6 When x = 3y

Substitute in the 3y for x:

5(3y - 3y) - 2(3y) = 6

5(0) - 6y = 6

-6y = 6

y = -1

Plug -1 in for y in the original equation:

5(x -3(-1)) - 2x = 6

5(x + 3) - 2x = 6

5x + 15 - 2x = 6

3x + 15 = 6

3x = -9

x = -3

Answer:

hope it helps

Step-by-step explanation:

please mark me as brainliest thank you

Answer:

I think option B is correct

generosity

hope my answer is helpful to you

plz mark me as brainlist

Step-by-step explanation:

The graphs intersect each other at points (-3, 2) and (1, 6).

The x-values of these points are -3 and 1.

Hence the 2 solutions are x = -3 and x = 1.

Answer:

x = 4

Step-by-step explanation:

From the pythagoras theorem

(x+2)^2 = x(5+x)

x^2 + 4x + 4 = 5x + x^2

x^2 + 4x + 4 - 5x - x^2 = 0

-x + 4 = 0

4 = x

Answer:

Step-by-step explanation:

add 12 and a number: 12 + c

subtract a number from 12: 12 - c

divide a number by 12: c : 12 or c/12

multiply 12 by a number: 12 · c = 12c

Answer:

the sum of a number and 12=   12+p

the quotient of a number and 12=    p/12

the difference between 12 and a number=   12-p

Step-by-step explanation:

The answer is definately 414

Answer:

40 miles per hour

Step-by-step explanation:

80 divided by  2 is 40

160 divided by 4 is 40