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Ksenya-84 [330]
3 years ago
6

Which expression is equivalent to 3(10-4y)

Mathematics
1 answer:
taurus [48]3 years ago
5 0
The answer is 30 -12y.

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At a university, 12% of students smoke. Calculate the expected number of smokers in a random sample of 140 students from this un
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Answer:

a) The expected number of smokers in a random sample of 140 students from this university is 16.8 smokers.

b) No, it is unlikely that smoking habits and waking up early to go to the gym on Saturday are independent.

Step-by-step explanation:

To calculate the expected numbers of smokers in a sample with size n=140 and proportion p=12%, we use the expected value of the binomial distribution:

E(x)=n\cdot p=140\cdot 0.12=16.8

The expected number of smokers in a random sample of 140 students from this university is 16.8 smokers.

If we take a sample at the opening of the gym, the sample is not expected to be representative of the population of the students. Most of the students that go to the gym usually have healthy habits, so the proportions of smokers is expected to be lower than the average of the university population.

4 0
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sleet_krkn [62]

Answer:

A

Step-by-step explanation:

I think that's the answer because

60 minutes = 1 hr

120 minutes = 2hrs

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(60,1)

(120,2)

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Polynormual sum of (x^2+9)+(-3x^2-11x+4)
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Answer:

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Step-by-step explanation:

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3 years ago
What are the solutions to the nonlinear system of equations below y=3x x^2+y^210
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I can help you but what is the operation of math
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AG=1 => BG=3 => CG=sqrt3 => CD = 2sqrt3 => perimeter = 3*CD= 6sqrt3
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3 years ago
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