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Pachacha [2.7K]
3 years ago
14

in the town zoo, 3/28 of the animals are birds. of the birds, 4/15 are birds of prey. what fraction of the animals are birds of

prey?
Mathematics
1 answer:
nalin [4]3 years ago
5 0
Let's call the animals "a" and birds "b"

b=\frac{3}{28}a

we knot this from3/28 of the animals are birds.

and we also know that 4/15 are birds of prey.  so

p=\frac{4}{15}b

we could substitute:

p=\frac{4*3}{15*28}

and solve:

p=\frac{1}{35}
and this is the answer!

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Answer: a) 15, b) 1.

Step-by-step explanation:

A researcher studying public opinion of proposed social security changes obtains a simple random sample of 35 adult Americans and asks them whether or not they support the proposed changes. To say that the distribution of the sample proportion of adults who respond yes, is approximately normal, how many more Americans does the researcher need to sample in the following cases?

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np=5\\\\n\times 0.10=5\\\\n=\dfrac{5}{0.10}\\\\n=50

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Here, p=0.15

So, again we get that

np=5\\\\n\times 0.15=5\\\\n=\dfrac{5}{0.15}\\\\n=33.33\\\\n\approx 34

So, there are 35-34=1 more adult Americans needed.

Hence, a) 15, b) 1.

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3 years ago
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krek1111 [17]
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Answer:

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