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2 years ago

Help!!!! This is a triangle and I really don’t understand it :(

Mathematics

2 answers:

zysi [14]2 years ago

4 0

Answer:

4x+1

Step-by-step explanation:

tekilochka [14]2 years ago

4 0

Answer: x is 3

Step-by-step explanation:

6x-5=4x+1

x = 3

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oksian1 [2.3K]

Profit=15

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3 years ago

(6n – 7) + (8n + 2) = 23

Dovator [93]

Answer:100

Step-by-step explanation:

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3 years ago

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The following table represents the running times of the men's 100 meters final at the London Olympics.

Rom4ik [11]

This cannot be fit into a normal distribution. While the first 7 runners all have times relatively close, the time of the last runner is an outlier, as it is too far from the other data points. The standard deviation is calculated by taking the mean, subtracting each value from the mean, squaring the deviations, adding these, then dividing by the number of data points (7), and taking the square root. This gives an answer of SD = 0.1107.

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4 years ago

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The dwarves of the Grey Mountains wish to conduct a survey of their pick-axes in order to construct a 99% confidence interval ab

Dmitry_Shevchenko [17]

Answer:

The minimum sample size needed is 125.

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of $\pi$ , and a confidence level of $1-\alpha$ , we have the following confidence interval of proportions.

$\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}$

In which

z is the zscore that has a pvalue of $1 - \frac{\alpha}{2}$ .

The margin of error is:

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

For this problem, we have that:

$\pi = 0.25$

99% confidence level

So $\alpha = 0.01$ , z is the value of Z that has a pvalue of $1 - \frac{0.01}{2} = 0.995$ , so $Z = 2.575$ .

What minimum sample size would be necessary in order ensure a margin of error of 10 percentage points (or less) if they use the prior estimate that 25 percent of the pick-axes are in need of repair?

This minimum sample size is n.

n is found when $M = 0.1$