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3 years ago

HELP PLSSS THIS IS HARD SOMEONEEE

Mathematics

1 answer:

vredina [299]3 years ago

8 0

Answer:

it's not even hard

Step-by-step explanation:

.....

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Can somebody help me please i’ll make your brainliest but you have to explain

vesna_86 [32]

Answer

first one

Step-by-step explanation:

Divide the numbers than Multiply all terms by the same value to eliminate fraction denominators than i got the first one

4 0

3 years ago

Read 2 more answers

How much does a sleeping bag cost? Let's say you want a sleeping bag that should keep you warm in temperatures from 20°F to 45°F

BARSIC [14]

Answer:

a) Sample Mean = 79.4

Sample standard deviation = 30.62

b) 90% Confidence interval: (67.56 ,91.24)

Step-by-step explanation:

We are given the following in the question:

Prices for sleeping bags has an approximately normal distribution.

We are given the following sample:

35, 85, 105, 40, 100, 50, 30, 23, 100, 110, 105, 95, 105, 60, 110, 120, 95, 90, 60, 70

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.

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

$Mean =\displaystyle\frac{1588}{20} = 79.4$

Sum of squares of differences = 1971.36 + 31.36 + 655.36 + 1552.36 + 424.36 + 864.36 + 2440.36 + 3180.96 + 424.36 + 936.36 + 655.36 + 243.36 + 655.36 + 376.36 + 936.36 + 1648.36 + 243.36 + 112.36 + 376.36 + 88.36 = 17816.8

$S.D = \sqrt{\displaystyle\frac{17816.8}{19}} = 30.62$

b) 90% Confidence interval:

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

Putting the values, we get,

$t_{critical}\text{ at degree of freedom 19 and}~\alpha_{0.10} = \pm 1.7291$

$79.4 \pm 1.73(\displaystyle\frac{ 30.62}{\sqrt{20}} ) = 79.4 \pm 11.84 = (67.56 ,91.24)$

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3 years ago

Please someone answer. Identify the vocabulary word that matches the picture.

miss Akunina [59]

Answer:

alternate interior angles

Step-by-step explanation:

The angles are alternate interior angles

They are between the parallel lines and on opposite sides of the transversal

5 0

3 years ago

BRAINLIEST, 40 points

ollegr [7]

Answer:

Step-by-step explanation:

as a negitive 1/2 is closer than 3/4

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4 years ago

The ratio of the number of boy campers to the number of girl campers with 8 to 7. If there were a total of 195 campers, how many

Veseljchak [2.6K]

<span>There are 8 girls per 15 campers because 8 divided by 7 boys and 8 girls. The proportion is 8/15. If there are 195 campers, then you are looking for the number of girls, so 8/15 = x/195, where x is the number of girls. Solve for x. 15x = 8(195) 1560 = 15x x = 104 104 girls. Number of boys = y, 195-104=y y = 91</span>

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3 years ago