Ask question

Ask question

All categories

3 years ago

15

You go to the deli counter at your grocery store and order 3/4 of a pound of sliced cheese that costs $7.99 per pound. The emplo

yee slices exactly 3/4 of a pound for you. What is the price of your cheese? _

2 answers:

Sergeeva-Olga [200]3 years ago

7 0

5 bucks i think im not sure dough'

labwork [276]3 years ago

6 0

Answer:

1/2 = 0.5 and 3/4 = 0.75

Use a proportion: 0.5/2.60 = 0.75/x

Cross multiply: 0.5x = 0.75*2.60

So x = 0.75*2.60/0.5 = 3.90

You might be interested in

Write a real-world problem that gives extra information. Tell what the extra information is.

yawa3891 [41]

1.That there is still slavery in the word. CNN 10 reporters caught on film a slave trade in Africa

2. Extra information is adding more information in your sentence to make it seem more interesting

6 0

3 years ago

The distribution of the weights ofloaves of bread from a certain bakery follow approximately a normaldistribution. Based on a ve

slega [8]

Answer:

D)

Step-by-step explanation:

ASSUMING NORMAL DISTRIBUTION, LESS THAN 10% AT LOWER END

OF 15.34 MEANS [DENOTING MEAN BY M AND Standard Deviation. BY S]

M±AS=20%....................M-AS=15.34

FOR 20% LEVEL .......A=1.281........FROM TABLES

M-1.281×S=15.34............................1

SIMILARLY

M±BS=40%...................M+BS=16.31

FOR 40% LEVEL .............B=0.841...................FROM TABLES

M+0.841×S=16.31.............................2

EQN.2 - EQN.1

2.122×S=0.97

S=0.457=0.46

M=15.926= 15.93

HENCE, D IS THE ANSWER

that is D. μ = 15.93, σ =.46

8 0

3 years ago

The following data were collected from 12 rain gauges in a park. Build a 95% CI for the mean rainfall at the park.

dybincka [34]

Answer:

Critical values: $t_{\alpha/2}=-2.201$ $t_{1-\alpha/2}=2.201$

95% confidence interval would be given by (3.646;4.472)

Step-by-step explanation:

1) Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

The data is:

4.65 3.89 2.73 4.35 3.80 4.86 4.33 4.37 4.76 4.05 3.05 3.87

2) Compute the sample mean and sample standard deviation.

In order to calculate the mean and the sample deviation we need to have on mind the following formulas:

$\bar X= \sum_{i=1}^n \frac{x_i}{n}$

$s=\sqrt{\frac{\sum_{i=1}^n (x_i-\bar X)}{n-1}}$

=AVERAGE(4.65,3.89,2.73, 4.35, 3.8, 4.86, 4.33, 4.37, 4.76, 4.05, 3.05, 3.87)

On this case the average is $\bar X= 4.059$

=STDEV.S(4.65,3.89,2.73, 4.35, 3.8, 4.86, 4.33, 4.37, 4.76, 4.05, 3.05, 3.87)

The sample standard deviation obtained was s=0.6503

3) Find the critical value t* Use the formula for a CI to find upper and lower endpoints

In order to find the critical value we need to take in count that our sample size n =12 <30 and on this case we don't know about the population standard deviation, so on this case we need to use the t distribution. Since our interval is at 95% of confidence, our significance level would be given by $\alpha=1-0.95=0.05$ and $\alpha/2 =0.025$ . The degrees of freedom are given by:

$df=n-1=12-1=11$

We can find the critical values in excel using the following formulas:

"=T.INV(0.025,11)" for $t_{\alpha/2}=-2.201$

"=T.INV(1-0.025,11)" for $t_{1-\alpha/2}=2.201$

The confidence interval for the mean is given by the following formula:

$\bar X \pm t_{\alpha/2}\frac{s}{\sqrt{n}}$

And we can use Excel to calculate the limits for the interval

Lower interval : "=4.059 -2.201*(0.6503/SQRT(12))" =3.646

Upper interval : "=4.059 +2.201*(0.6503/SQRT(12))" =4.472

So the 95% confidence interval would be given by (3.646;4.472)

8 0

3 years ago

Use the graph to answer the question.

dmitriy555 [2]

Answer:

B.

Step-by-step explanation:

hope it helps :)

3 0

3 years ago

Armando spent $9.70 at the grocery store. he spent $2.95 on a bag of baby spinach and bought tomatoes at $2.25 per pound. How ma

Sever21 [200]

He bought 3 pounds of tomatoes

6 0

3 years ago