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BaLLatris [955]
2 years ago
12

a copy machine can copy a report in 30 min. when a second copy machine is used at the same time, the copying can be done in 18 m

in. how long would it take the second copy machine to do the copying alone?
Mathematics
1 answer:
Marta_Voda [28]2 years ago
4 0

Answer:

Step-by-step explanation:

A copy machine can copy a report in 30 mins. When a second copy machine is used at the same time, the copying can be sone in 18 min. How long would it take the second copu machine to do the copying alone?

i have:

x=30

x+y=18

that would be -12..not right?

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A sample of 300 urban adult residents of a particular state revealed 65 who favored increasing the highway speed limit from 55 t
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Alternative hypothesis(Ha) says sentiment for increasing speed limit in the two populations is different

Where p1 is the first population proportion =65/297= 0.22

And p2 is the second population proportion = 78/189= 0.41

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Hence H0= p1-p2=0

Ha=p1-p2≠0

Test statistic= p1-p2/√p(1-p) (1/n1+1/n2)

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We therefore reject null hypothesis as critical value is greater than test statistic

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Hence probability =0.4998

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3 years ago
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Answer:

Step-by-step explanation:

1. no

2. yes

3. yes

4. yes

5. 5.2

6. 4.5

7. 2.5

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