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2 years ago

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Of 250 seventh grade students, 130 walk to school. What percent of seventh graders do not walk to school? % of seventh graders d

o not walk to school.

2 answers:

kvv77 [185]2 years ago

8 0

48%

48% of 250 is 120

120+130=250

Bad White [126]2 years ago

7 0

Answer:

48%

Step-by-step explanation:

I like to look at percentages as test grades. If you got a 130/250 on a test, you would simply need to view the dash line as a 'divided by'. So you would figure 130 divided by 250 is .52, or 52%... Then, you would need to subtract 52 from 100 to get 48% to get the percentage of people who do not walk to school.

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Sales of a new line of athletic footwear are crucial to the success of a company. The company wishes to estimate the average wee

MariettaO [177]

Answer:

188 weeks of data must be sampled.

Step-by-step explanation:

From the information given, we can deduce that:

The Margin of error is within = 200

The confidence interval = 95%

The level of significance = 1 - C.I

= 1 - 0.95

= 0.05

The standard deviation = 1400

The number of weeks the data must be sampled can be determined by using the formula for sample size which is:

$n =( \dfrac{Z_{\alpha/2} \times \sigma}{E} )^2$

$n =( \dfrac{Z_{0.05/2} \times 1400}{200} )^2$

$n =( \dfrac{1.96 \times 1400}{200} )^2$

$n =( \dfrac{2744}{200} )^2$

$n =( 13.72)^2$

n = 188.24

n ≅ 188

Thus, 188 weeks of data must be sampled.

6 0

2 years ago

The cost of a parking permit consists of a one-time administration fee plus a monthly fee. a permit purchased for 12 months cost

julsineya [31]

let

x--------> the monthly fee

y--------> the administration fee

we know that

$660=y+12x$ --------> equation $1$

$810=y+15x$ --------> equation $2$

Multiply by $-1$ equation $1$

$-660=-y-12x$ ------> equation $3$

Adds equation $2$ and equation $3$

$810=y+15x\\-660=-y-12x\\---------\\ 810-660=15x-12x\\ 3x=150\\ x=50\ dollars$

Find the value of y

$660=y+12x\\ 660=y+12*50\\ y=660-600\\ y=60\ dollars$

therefore

the answer is

the administration fee is equal to $60\ dollars$

4 0

2 years ago

Read 2 more answers

Reika [66]

${\huge \underline{{ \fbox \color{red}{A}}{\fbox \color{green}{n}}{\fbox \color{purple}{s}}{\fbox \color{brown}{w}}{\fbox \color{yellow}{e}}{\fbox \color{gray}{r } }}}$

$\: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \bf \red{ \dfrac{1}{2} + \dfrac{1}{4} = \dfrac{3}{4} }$

Step by step explanation :-

The only thing you have to do is add the numerator to the denominator, in this case you have to add the first ones from the front, which can be these 2+1/4, which would result in 3/4, and this is called the Commutative Property.

$\: \: \: \: \: \: \: \: \: \: \: \: \: \: \boxed{ \bf \gray{ \dfrac{1}{2} + \dfrac{1}{4} = \dfrac{1}{4} + \dfrac{1}{2} }}$

$\: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \boxed{ \bf \green{\dfrac{2 + 1}{4} = \dfrac{1 + 2}{4} }}$

$\: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \boxed {\bf \blue{\dfrac{3}{4} = \dfrac{3}{4}} }$

Answer :- The answer is 3/4

¿What is commutative property?

It is to change different ways in order of the addends the result would be the same.

Example :-

$\: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \boxed {\bf \blue{\dfrac{a}{b} + \dfrac{c}{d}} = {\dfrac{c}{d} + \dfrac{a}{b}} }$

I hope I've helped : )

5 0

2 years ago

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Svetlanka [38]

B is false, since by the inclusion/exclusion principle,

$P(X\cup Y)=P(X)+P(Y)-P(X\cap Y)$

By independence, we have $P(X\cap Y)=P(X)P(Y)$ , which is zero if either of $P(X)$ or $P(Y)$ is 0, which isn't guaranteed.

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2 years ago

X + 3 1/2 = 10 What is the value of x?

Evgen [1.6K]

Answer:

X = 6 1/2

Step-by-step explanation:

X is equal to 6 1/2 because, if you subtract 3 1/2 from 10 you will be left with 6 1/2.

3 0

2 years ago