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3 years ago

Part 1

Mathematics

2 answers:

soldi70 [24.7K]3 years ago

5 0

Answer:

Look it up on G o o gle it real easy :)

Step-by-step explanation:

crimeas [40]3 years ago

5 0

Answer:

1/2 x +4

Step-by-step explanation:

Sorry I was late! But I hope this helps! (this is correct on edmentum I don't know about anything else though)

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If the 9 in 506,092 is moved.two places to the right how does the value of the 9 change

Natasha_Volkova [10]

Answer: It becomes the tenth value of the number

Step-by-step explanation:

if the value of 9 in the number 506,092 is moved two places to the right then it changes it position from the ten place to the tenth place. It will become like this 506,020.9 the 9 is being move two places to the right.

7 0

4 years ago

A bicycle ramp shown below measure 25 feet long and is 7 feet off the ground at its highest point. How many feet long is the bas

Lerok [7]

Answer:

Step-by-step explanation:

A bicycle ramp shown below measure 25 feet long and is 7 feet off the ground at its highest point. How many feet long is the base of the ramp.

5 0

3 years ago

Easy points.................

lawyer [7]

Answer:

17 i think

Step-by-step explanation:

7 0

4 years ago

Read 2 more answers

The Greater Pittsburgh Area Chamber of Commerce wants to estimate the mean time workers who are employed in the downtown area sp

Valentin [98]

Answer:

98% Confidence interval: (31.74,38.4)

Step-by-step explanation:

We are given the following data set:

29, 38, 38, 33, 38, 21, 45, 34, 40, 37, 37, 42, 30, 29, 35

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.

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

$Mean =\displaystyle\frac{526}{15} = 35.07$

Sum of squares of differences = 506.93

$S.D = \sqrt{\displaystyle\frac{506.93}{14}} = 6.02$

98% Confidence interval:

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

Putting the values, we get,

$t_{critical}\text{ at degree of freedom 14 and}~\alpha_{0.02} = \pm 2.145$

$35.07 \pm 2.145(\frac{6.02}{\sqrt{15}} ) = 35.07 \pm 3.33 = (31.74,38.4)$

Thus, there is 98% confidence that the population mean number of minutes spent traveling by workers is between 31.74 mins and 38.40

4 0

3 years ago

Suppose the probability of a false positive result on a mammogram is 4%. Suppose that the probability of a false negative result

Mariulka [41]

Answer:

0.0049 = 0.49% probability that she actually has breast cancer

Step-by-step explanation:

Conditional Probability

We use the conditional probability formula to solve this question. It is

$P(B|A) = \frac{P(A \cap B)}{P(A)}$

In which

P(B|A) is the probability of event B happening, given that A happened.

$P(A \cap B)$ is the probability of both A and B happening.

P(A) is the probability of A happening.

In this question:

Event A: Positive test result

Event B: Breast cancer

Probability of a positive test result:

4% of (1 - 0.0002)

98% of 0.0002

$P(A) = 0.04*(1 - 0.0002) + 0.98*0.0002 = 0.040188$

Having breast cancer and testing positive.

98% of 0.0002

$P(A \cap B) = 0.98*0.0002 = 0.000196$

What is the probability that she actually has breast cancer?

$P(B|A) = \frac{0.000196}{0.040188} = 0.0049$

0.0049 = 0.49% probability that she actually has breast cancer

8 0

3 years ago