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3 years ago

15

3 lbs for $21 at that rate how would 9 lbs cost

2 answers:

FrozenT [24]3 years ago

8 0

The cost for 9 lbs would be 63 dollars

earnstyle [38]3 years ago

7 0

Well we are going to use 3lbs for $21 as our rate.
Lets set it up in a fraction.

3lbs
--------
$21

So we want to know how much 9lbs would cost..
Well lets set that up as a fraction as well.
9lbs
--------
x

We put x there because we dont know how much 9lbs will cost.

Now we know that in order to get 9lbs they just multipled 3lbs x 3
And that gave us 9lbs!!!
3lbs x 3 = 9lbs

Now when dealing with fractions we must always keep one rule in mind.
What ever you do to the top you must do to the bottom.
So we could multiply $21 by 3 and get our 9lbs cost!!
$21 x 3 = $63

So this means we can finally say our answer!
Answer = 9lbs would cost $63

Good Luck! :)

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Answer:

$\dfrac{2}{3}$

Step-by-step explanation:

Given that:

The number of observations is:

6, 10, 12

If we are to use a simple random sampling without replacement, then we will have:

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Here;

the sample size n = 2

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For (6,10) ; The sample mean = $\dfrac{6+10}{2}$

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For (6,12) ; The sample mean = $\dfrac{6+12}{2}$

= $\dfrac{18}{2}$

= 9

For (10, 12) ; The sample mean = $\dfrac{10+12}{2}$

= $\dfrac{22}{2}$

= 11

The probability distribution of sample mean(x) is:

X 8 9 11

P(X=x) $\dfrac{1}{3}$ $\dfrac{1}{3}$ $\dfrac{1}{3}$

Thus, the probability that the sample mean is larger than 8 is:

P(X> 8) = P(X = 9) + P(X + 11)

P(X> 8) = $\dfrac{1}{3}+\dfrac{1}{3}$

P(X > 8) = $\dfrac{1+1}{3}$

P(X> 8) = $\dfrac{2}{3}$

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svetlana [45]

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Alina [70]

Answer:

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