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I am Lyosha [343]
3 years ago
9

A finite population consists of four elements: 6, 1, 5, 3. (a) how many different samples of size n = 2 can be selected from thi

s population if you sample without replacement? (sampling is said to be without replacement if an element cannot be selected twice for the same sample.)
Mathematics
1 answer:
Ber [7]3 years ago
5 0
Since the order of elements doesn't matter, we use the formula for combination as follows.

nCk= \frac{n!}{k!(n-k)!}

So the number of ways to choose 2 elements from a set of 4 elements would be
4C2= \frac{4!}{2!(4-2)!}=6

Thus the answer is 6. 
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3 years ago
I NEED A MATH WIZ!
valentinak56 [21]
So each of these statements are talking about the square footage of land per person. Let's go and find it!

First off, let's find the number in each building of the original complex:
280 people / 4 buildings

Each building has an equal number of residents. So just divide:
280/4 = 70.

So 70 residents per building

Now consider the fact that once a new building is built, another 70 people will move in.
280 + 70= 350

350 people total.

Then lets look at the plot of land
Originally, there are 200,000 square feet of land for the 4 buildings. Then after the expansion, the plot of land will be:
200,000 + 200*200
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Go back to the question. What's the effect of the expansion in terms of square feet of land per person?
Divide!
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Then since it's being compared to the amount each resident had before the expansion, do the same thing with the corresponding numbers:
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So how much will each person's land decrease?
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The answer is the first choice!

Hope this helps
4 0
3 years ago
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