3 years ago

What is a random sampling

Mathematics

1 answer:

Masja [62]3 years ago

8 0

Random sampling is when you select a random group of people for something.

Ex. Out of a population of 259,096 people, a random sample of 400 people are choosen.

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32 divided by 8 equals what

lbvjy [14]

32 divided by 8 equals 4.

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3 years ago

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Find b(4) in the sequence given by b(1) = -5 b(n) = b(n-1) + 9 b(4) =

Harrizon [31]

Answer: 22

Step-by-step explanation:

I got it right on khan academy

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3 years ago

Three dogs for each cat a) d=3c b) 3d=c c) d= 3/c d) c=3/d

ivanzaharov [21]

The answer is would have to be b.

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3 years ago

If you have 20 dollars and you you need to give your friend 5 dollars out of that, how much money will you have left

notsponge [240]

Answer: 15 dollars
20 -5 = 15

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3 years ago

What is the 9th term of the geometric sequence 4, −20, 100, …?

sveta [45]

First, we are going to find the common ratio of our geometric sequence using the formula: $r= \frac{a_{n}}{a_{n-1}}$ . For our sequence, we can infer that $a_{n}=-20$ and $a_{n-1}=4$ . So lets replace those values in our formula:
$r= \frac{-20}{4}$
$r=-5$

Now that we have the common ratio, lets find the explicit formula of our sequence. To do that we are going to use the formula: $a_{n}=a_{1}*r^{n-1}$ . We know that $a_{1}=4$ ; we also know for our previous calculation that $r=-5$ . So lets replace those values in our formula:
$a_{n}=4*(-5)^{n-1}$

Finally, to find the 9th therm in our sequence, we just need to replace $n$ with 9 in our explicit formula:
$a_{9}=4*(-5)^{9-1}$
$a_{9}=4*(-5)^{8}$
$a_{9}=1562500$

We can conclude that the 9th term in our geometric sequence is 1,562,500

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2 years ago