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3 years ago

8

Find the standard deviation. Round to the nearest tenth when necessary.

1 answer:

stepladder [879]3 years ago

4 0

Answer:

d. S.D= 7.3

Step-by-step explanation:

x f f(x) x² f(x²)

75 2 150 5625 11250

80 3 240 6400 19200

85 2 170 7225 14450

90 2 180 8100 16200

95 0 0 9025 0

100 1 100 10000 10000

Sum f= 10 fx= 840 f(x²) = 71,100

Standard Deviation = √Sum fx² - (Sum f(x))²/sum f/ f

S.D= √71,100- (840)²/10/10

S.D= √71,100- 70560/10

S.D= √540/10

S.D= √54

S.D= 7.348 ≅7.3

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Find the point estimate for the true difference between the given population means. Round your answer to three decimal places.

uranmaximum [27]

Answer:

Point Estimate for different between population means = - 0.99

Step-by-step explanation:

We are given data of two samples and we have to find the best point estimate of the true difference between two population means. Remember that in absence of data about population the best estimator is the sample data. So, we will find the means of both sample data and find the difference of that means. This difference between the means of sample data will be the best point estimate for the true difference between the population means.

Formula to calculate the mean is:

$Mean=\frac{\text{Sum of Values}}{\text{Number of Values}}$

Mean of Sample 1:

$Mean=\frac{1414}{11}=128.55$

Mean of Sample 2:

$Mean=\frac{1684}{13}=129.54$

Therefore the best point estimate for difference between two population means would be = Mean of Sample 1 - Mean of Sample 2

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= - 0.99

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3 years ago

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goldenfox [79]

Answer:

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Step-by-step explanation:

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3 years ago

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Ivanshal [37]

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2 years ago

The cost of purple dye has been increasing over the last few months, and Robyn uses this dye as part of her tie dye scarf busine

joja [24]

The lowest percentage increase in the cost of dye that would make the scarves unprofitable is 42%

<h3>How to calculate the percentage?</h3>

(Price- Unit Cost)/Price= 20% or 0.2

Price- Unit Cost= 0.2 Price

0.8 Price = Unit Cost

Let Unit Cost be x

Price = x/0.8= 1.25x

Dye is 60% of unit costs= 0.6x

Cost of remaining material= 1 - 0.6x = 0.4x

Unit Cost= Cost of Dye+ Cost of remaining material

So, in order to become unprofitable, Unit Cost must be 1.25x

Therefore

1.25x= Maximum cost of dye+ 0.4x

Maximum Cost of Dye = (1.25-0.4)x = 0.85x

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Therefore, theowest percentage increase in the cost of dye that would make the scarves unprofitable is 42%.

Learn more about percentages on:

brainly.com/question/24877689

#SPJ1

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1 year ago

Which comes first? Intermediate algebra, or algebra?

xxTIMURxx [149]

Answer

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Step-by-step explanation:

Intermediate is the same as algebra 2

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4 years ago

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