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3 years ago

10

Stephanie spent $110 on 1.7 pounds of coffee. she wants to know how much each pound costs. how would she find out how much each

pound costs? write equation and explain how you got that answer.

1 answer:

JulijaS [17]3 years ago

8 0

$64.71 rounded, explanation attached

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A statistic instructor randomly selected four bags of oranges, each bag labeled 10 pounds, and weighed the bags.They weighed 9.3

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Answer:

95% confident the population mean is between (9.1,9.9)

Step-by-step explanation:

We are given the following data set:

9.3, 9.7, 9.2, 9.7

Formula:

$\text{Standard Deviation} = \sqrt{\displaystyle\frac{\sum (x_i -\bar{x})^2}{n-1}}$

where $x_i$ are data points, $\bar{x}$ is the mean and n is the number of observations.

$Mean = \displaystyle\frac{\text{Sum of all observations}}{\text{Total number of observation}}$

$Mean =\displaystyle\frac{37.9}{4} = 9.475$

Sum of squares of differences = 0.2075

$S.D = \sqrt{\frac{0.2075}{3}} = 0.262$

95% Confidence interval:

$\bar{x} \pm t_{critical}\displaystyle\frac{s}{\sqrt{n}}$

Putting the values, we get,

$t_{critical}\text{ at degree of freedom 3 and}~\alpha_{0.05} = \pm 3.182$

$9.475 \pm 3.182(\frac{0.262}{\sqrt{4}} ) = 9.475 \pm 0.416842 =(9.058158,9.891842) \approx (9.1,9.9)$

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3 years ago

The bike store marks up the wholesale cost of all of the bikes they sell by 30%. The store buys a bike for $125. How much will t

JulsSmile [24]

Answer:

$162.50

Step-by-step explanation:

this is because 30°/• of 125 us 37.5 then if you add that you get 162.50

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3 years ago

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Sam invests $6000 in two different accounts. The first account paid 12 %, the second account paid 7 % in interest. At the end of

Lunna [17]

Answer:

The amount in the account at 12% interest is $3400 and the amount in the second account at 7% interest is $2600

Step-by-step explanation:

Let x be the amount in the account at 12% interest

So, 6000-x is the amount in the second account at 7% interest

$SI = \frac{P \times T \times R}{100}$

First account: $SI=\frac{x \times 1 \times 12}{100}$

Second account : $SI =\frac{(6000-x) \times 1 \times 7}{100}$

We are given that At the end of the first year he had earned $590 in interest.

So, $\frac{x \times 1 \times 12}{100}+\frac{(6000-x) \times 1 \times 7}{100}=590\\x=3400$

So,the amount in the account at 12% interest is $3400

The amount in the second account at 7% interest =6000-x=6000-3400=2600

Hence the amount in the account at 12% interest is $3400 and the amount in the second account at 7% interest is $2600

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4 years ago

just olya [345]

Answer:

34

Step-by-step explanation:

area is height times wdth .....then come to conclude that

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I’m starting 7th grade and don’t know what to expect someone plz help!

TEA [102]

Learn to balance school and life is all i can say. if you do that you’ll be fine

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3 years ago

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