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LenaWriter [7]
3 years ago
8

Two water pumps are filling a pool. One of the pumps is high power and can fill the pool 5 hours before the other can do. Howeve

r, they both working together can fill half of the pool in 3 hours. In how many hours the high power pump can fill the pool?
Mathematics
1 answer:
beks73 [17]3 years ago
6 0

Answer:

add here be back charger

Step-by-step explanation:


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An opinion poll asks a simple random sample of 100 college seniors how they view their job prospects. In all, 53 say "good." Doe
ValentinkaMS [17]

Answer:

We are tryng to proof if more than half of all seniors think their job prospects are good so that would be the alternative hypothesis and the complement rule would be the null hypothesis.:  

Null hypothesis:p\leq 0.5  

Alternative hypothesis:p > 0.5  

Step-by-step explanation:

Information provided

n=100 represent the random sample ofcollege senior selected

X=53 represent the college seniors who say good

\hat p=\frac{53}{100}=0.53 estimated proportion of seniors who think their job prospects are good

p_o=0.5 is the value that we want to test

z would represent the statistic

p_v represent the p value

System of hypothesis

We are tryng to proof if more than half of all seniors think their job prospects are good so that would be the alternative hypothesis and the complement rule would be the null hypothesis.:  

Null hypothesis:p\leq 0.5  

Alternative hypothesis:p > 0.5  

The statistic is given by:

z=\frac{\hat p -p_o}{\sqrt{\frac{p_o (1-p_o)}{n}}} (1)  

Replacing the info given we have:

z=\frac{0.53 -0.5}{\sqrt{\frac{0.5(1-0.5)}{100}}}=0.6  

The p value for this case would be given by

p_v =P(z>0.6)=0.274  

7 0
4 years ago
Find two integers whose sum is 20 and product Is 100​
Neporo4naja [7]

Answer: 10

Step-by-step explanation:

10+10 = 20

10 x 10 = 100

mi would do another but i supposed to be in class :P

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slamgirl [31]

Answer:

A)  m∠3 + m∠4 = 180

Step-by-step explanation:

Both angles make a straight line which has an angle of 180.

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4 years ago
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Picture with question help plz
kirill [66]

Let a_{1} = -9, a_{2} = -12 and so on.

-15 = -9 + (-6)

-15 = -9 + 2(-3)

Let -3 be the common difference, or <em>d</em>.

a_{n} = -9 + n(-3)

    = -9 - 3n

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3 years ago
What is an equivalent ratio of 2:3
just olya [345]

Answer:6 : 15

Step-by-step explanation:

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3 years ago
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