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3 years ago

Calculators are on sale at a price of $1,000 for 20 how many can be purchased for 1250

Mathematics

1 answer:

Kruka [31]3 years ago

8 0

Answer:

25 calculators

Step-by-step explanation:

each calculator costs $50 (1000÷20)

so 1250÷50=25

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What is the correlation coefficient with the following data points: (15,36), (13,22), (12,6), (11,20)?

Rina8888 [55]

Answer:

A. 0.75

Step-by-step explanation:

The formula for the correlation coefficient r is

$r =\frac {n \sum{xy} - \sum{x}\sum{y}}{\sqrt{[n \sum{x^{2}}- (\sum{x})^{2}}][n \sum{y^{2}}- (\sum{y})^{2}]}$

It's easier to use a statistical calculator, but this question probably expects you to do it by hand.

Let’s write a table for easy calculation.

x y xy x² y²

15 36 540 225 1296

13 22 286 169 484

12 6 72 144 36

11 20 220 121 400

51 84 1118 659 2216

(Σx)² = 2601

(Σy)² = 7056

$r =\frac{4\times1118-51\times84}{\sqrt{[4\times659-2601][4\times2216-7056]}}$

$r =\frac{4472-4284}{\sqrt{[2636-2601][8864-7056]}}$

$r =\frac{188}{\sqrt{35\times1808}}$

$r =\frac{188}{\sqrt{63280}}$

$r =\frac{188}{251.6}$

r = 0.747

The graph below shows that there is a poor correlation among the points.

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3 years ago

A bell tolls every 10 minutes. Another bell tolls every 15 minutes. Both bells toll at 6:00 PM. They will toll together again at

Verizon [17]

Im pretty sure they will both ring at the same time at 6:30

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3 years ago

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Juan unloads 29 bags of pine mulch from each of his fathers 2 trucks. Together, the truck holds 2,262 pounds of pine mulch. What

Tamiku [17]

I think the weight is 78 pounds for each bag. I could be wrong.. I'm not sure. I did 2,262 divided by 29.

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4 years ago

Peaches are on sale for 0.95 cents per pounds if i have 2.75 pounds how much did i pay for the peaches?

Dennis_Churaev [7]

Answer:

$2.61

Step-by-step explanation:

I think you mean 0.95 dollars per pound. 0.95 cents means it's less than a dime per pound.

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3 years ago

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A banana peel weighs 1/12 of the total weight of a banana. If an unpeeled banana balances a peeled banana of the same weight, p

Ilia_Sergeevich [38]

Answer:

11 ounces

Step-by-step explanation:

Unpeeled = X

Peeled = (1 - 1/12)X = (11/12)X

X = (11/12)X + (11/12)

X - (11/12)X = 11/12

(1/12)X = 11/12

X = 11 ounces

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3 years ago

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Calculators are on sale at a price of $1,000 for 20 how many can be purchased for 1250​

Calculators are on sale at a price of $1,000 for 20 how many can be purchased for 1250