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3 years ago

I chose b and d and they are both wrong

Mathematics

2 answers:

mash [69]3 years ago

7 0

The answer to your question is c.

Keith_Richards [23]3 years ago

4 0

It’s obviously c dummy

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A project has three paths and a desired completion time of 43 days. The first path has a 70 percent probability of being complet

8090 [49]

Answer: The required probability is 0.82.

Step-by-step explanation:

Since we have given that

Number of projects = 3

So, probability of getting each project = $\dfrac{1}{3}$

Probability of first path being completed in 43 days = 0.7

Probability of second path being completed in 43 days = 0.85

Probability of third path being completed in 43 days = 0.90

So, Probability that the project will be completed on time would be

$\dfrac{1}{3}(0.7+0.85+0.90)\\\\=\dfrac{1}{3}\times 2.45\\\\=0.82$

Hence, the required probability is 0.82.

3 0

3 years ago

A researcher reports the following confidence interval for a comparison of the difference between two groups: 95% CI −12.0 [−30.

Lapatulllka [165]

Answer:

Decision: Support the null hypothesis.

Sample mean: -12

Step-by-step explanation:

Hello!

When deciding with a Confidence interval you have to keep in mind that the following conditions are met:

The hypothesis and the interval are made for the same parameter.
The hypothesis should be two-tailed.
The interval and the test have to have complementary confidence and signification levels. This means that if the interval is made with 1 - α= 0.95 the hypothesis test should be made with α= 0.05.

H₀: μ₁ - μ₂= 0

H₁: μ₁ - μ₂≠ 0

α: 0.05

If the interval contains the cero, it means that there is no difference between the means, so you support the null hypothesis.

If the interval doesn't contain the cero, there is a difference between the two means, so you reject the null hypothesis.

The intervals to estimate the population mean have the following structure:

Estimator ± Margin of error

This means that the sample mean (point estimate of the population mean) is in the middle of the calculated interval. To know it's the value you have to do a simple calculation:

sample mean: $\frac{Upper bound + Lower bound}{2}$

sample mean: $\frac{6 + (-30)}{2}$

sample mean: -12

I hope it helps!

7 0

4 years ago

For which value of theta is tan theta equal to sin theta?

dedylja [7]

The question asks us to find the value of $\theta$ such that $tan(\theta)=sin(\theta)$ . First, we subtract $sin(\theta)$ from both sides, which gives us $tan(\theta)-sin(\theta)=0$ . Now, we need to express the equation as $sin$ and $cos$ . When we do this, we get $\frac{sin(\theta)}{cos(\theta)} -sin(\theta)=0$ . After simplifying, we get $\frac{sin(\theta)-sin(\theta)cos(\theta)}{cos(\theta)} =0$ . All that's left now is factoring and simplifying, giving us $\boxed{\theta=2\pi}$ as an answer. Hope this helped and have a phenomenal day!

7 0

3 years ago

Two sides of a triangle have lengths 6 and 17. Which expression describes the length of the third side?

spin [16.1K]

Depending on the type of triangle for an acute triangle I'd say b if an right c and if its obtuse d

6 0

4 years ago

5-(n-4)= 3 (n + 2)<br> what does n equal

Amanda [17]

Answer:

The value of n in this equation is -3/4

Step-by-step explanation:

5 - (n - 4) = 3 (n + 2)

Distribute the negative to (n - 4) and distribute 3 to (n + 2).

5 - n + 4 = 3n + 6

Add 4 to -5.

9 - n = 3n + 6

Subtract 9 from 6.

-n = 3n - 3

Subtract 3n from n.

4n = -3

Divide 4 by -3.

n = -3/4

6 0

3 years ago