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2 years ago

3. 18 is 40% of what number?

Mathematics

2 answers:

Mariulka [41]2 years ago

8 0

#Lets just write x as the nunber you asked

x × 40/100 = 18

x = 18 : 40/100

x = 18 × 100/40

y = 1800/40

y = 45

<h3>Answer : 45</h3>

DIA [1.3K]2 years ago

8 0

Answer:

Step-by-step explanation:

take the unknown number as z

40%=40/100

40/100×z=18

2/5×z=18. (40/100=2/5)

z=18/2×5

z=45

Hope you've understood

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In 1979 the Wincom river was 33 feet below the bridge. Because of silt build-up in the river bottom, the

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Answer: d = 40 - 5/2t; 1995

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1 year ago

A person purchased a slot machine and tested it by playing it 1,137 times. There are 10 different categories of outcomes, includ

ivann1987 [24]

Answer:

$p_v= P(\chi^2_{9}>11.517)=0.2419$

And on this case if we see the significance level given $\alpha=0.1$ we see that $p_v>alpha$ so we fail to reject the null hypothesis that the observed outcomes agree with the expected frequencies at 10% of significance.

Step-by-step explanation:

A chi-square goodness of fit test determines if a sample data obtained fit to a specified population.

$p_v$ represent the p value for the test

O= obserbed values

E= expected values

The system of hypothesis for this case are:

Null hypothesis: $O_i = E_i[/tex[Alternative hypothesis: [tex]O_i \neq E_i$

The statistic to check the hypothesis is given by:

$\chi^2 =\sum_{i=1}^n \frac{(O_i -E_i)^2}{E_i}$

On this case after calculate the statistic they got: $\chi^2 = 11.517$

And in order to calculate the p value we need to find first the degrees of freedom given by:

$df=n-1=10-1=9$ , where k represent the number of levels (on this cas we have 10 categories)

And in order to calculate the p value we need to calculate the following probability:

$p_v= P(\chi^2_{9}>11.517)=0.2419$

6 0

3 years ago

PLEASE HELP :)

Gnom [1K]

Answer:

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Step-by-step explanation:

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3 years ago

Read 2 more answers

-3(p-7) > 21 solve for p

Goryan [66]

Answer:

p < 0

Step-by-step explanation:

Given

- 3(p - 7) > 21

Divide both sides by - 3, reversing the symbol as a result of dividing by a negative quantity.

p - 7 < - 7 ( add 7 to both sides )

p < 0

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3 years ago

Someone plz help me :(

Ostrovityanka [42]

Answer:

i can JUST GET ON YOUR CROME BOOK

Step-by-step explanation:

3 0

2 years ago

3. 18 is 40% of what number?​

3. 18 is 40% of what number?