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sergejj [24]
3 years ago
10

3. Which is the better buy?

Mathematics
2 answers:
Olegator [25]3 years ago
5 0

Answer:

3.49 for 8 candles

Step-by-step explanation:

2.99/6=.49833

4.49/9=.49888

5.99/12=.49916

3.49/8=.43625

maksim [4K]3 years ago
5 0

Unit rate is total price divided by quantity. This gives you the cost for 1 item.

Unit costs:

2.99 / 6 = 0.4983 each

4.49 / 9 = 0.4988 each

5.99 / 12 = 0.4991 each

3.49 / 8 = 0.4362 each

The Best Buy would be the one with the lowest unit price.

The Best Buy would be 3.49 for 8 candles.

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Use the formula to find the standard error of the distribution of differences in sample means, x¯1-x¯2. Samples of size 100 from
garri49 [273]

Answer:

standard error = 2.11

Step-by-step explanation:

First we stablish the data that we have for each sample:

<u>Population 1</u>                                          <u>Population </u>2

n₁ = 100                                                     n₂ = 90

x¯1= 95                                                    x¯2 = 75

σ₁ = 14                                                        σ₂ = 15                  

To calculate the standard error of each sample we would use the formulas:

σ = σ₁/√n₁

σx¯2 =  σ₂/√n₂

Now, in order to obtain the standard error of the differences between the two sample means we combine those two formulas to obtain this:

σx¯1 - σ x¯2  = √(σ₁²/n₁ + σ₂²/n₂ )

So as you can see, we used the square root to simplify and now we require the variance of each sample (σ²):

σ₁² = (14)² = 196

σ₂² = (15)² = 225

Now we can proceed to calculate the standard error of the distribution of differences in sample means:

σx¯1 - σx¯2  = √(196/100 + 225/90) =  2.11

This gives an estimate about how far is the difference between the sample means from the actual difference between the populations means.

6 0
3 years ago
Evaluate the function f(x) = 3x2− 2x for x= 4.
kykrilka [37]

Answer:

40

Step-by-step explanation:

f(4) = 3(4²) - 2(4)

= 3(16) - 8

= 48 - 8

= 40

when x=4, f(x) = 40

6 0
2 years ago
Is 90.31 greater than 90.302
mash [69]

Answer:

90.31 is greater than 90.302

Step-by-step explanation:

6 0
3 years ago
Insert a rational number and an irrational number between -2/5 and 1/2
qwelly [4]

Answer:

Step-by-step explanation:

if you can pick any numbers you want then:

rational could be: 0.25 or 1/4

irrational could be: 2/7

6 0
3 years ago
Pl help it’s for a grade
allsm [11]

Answer:

(^6√x^5) (√y)

(The 6 belongs in the left on top of the square root btw)

For x the 6 moves to the front of the square root while the 5 becomes the power of x.

For y, the power to the 1/2 is the same as a square root.

5 0
2 years ago
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