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3 years ago

Find the solution for the equation and check it. n-3=-1 Solution: Check:

Mathematics

1 answer:

Ksju [112]3 years ago

6 0

Answer:

n = 2

Step-by-step explanation:

-1 + 3 = 2

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What is the mean of this discrete random variable?

melisa1 [442]

My answer is 28.5 i believe i just added all of my numbers for the x variable and i divided it by by 6 because thats how many numbers you have

5 0

3 years ago

5. The superintendent of the local school district claims that the children in her district are brighter, on average, than the g

anygoal [31]

Answer:

We conclude that children in district are brighter, on average, than the general population.

Step-by-step explanation:

We are given the following data set:

105, 109, 115, 112, 124, 115, 103, 110, 125, 99

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.

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

$Mean =\displaystyle\frac{1117}{10} = 111.7$

Sum of squares of differences = 642.1

$S.D = \sqrt{\frac{642.1}{49}} = 8.44$

We are given the following in the question:

Population mean, μ = 106

Sample mean, $\bar{x}$ = 111.7

Sample size, n = 10

Alpha, α = 0.05

Sample standard deviation, s = 8.44

First, we design the null and the alternate hypothesis

$H_{0}: \mu = 106\\H_A: \mu > 106$

We use one-tailed(right) t test to perform this hypothesis.

Formula:

$t_{stat} = \displaystyle\frac{\bar{x} - \mu}{\frac{s}{\sqrt{n}} }$

Putting all the values, we have

$t_{stat} = \displaystyle\frac{111.7 - 106}{\frac{8.44}{\sqrt{10}} } = 2.135$

Now,

$t_{critical} \text{ at 0.05 level of significance, 9 degree of freedom } = 1.833$

Since,

$t_{stat} > t_{critical}$

We fail to accept the null hypothesis and reject it. We accept the alternate hypothesis.

We conclude that children in district are brighter, on average, than the general population.

4 0

3 years ago

What's 65-70 days in weeks

dusya [7]

Answer:

About 9-10 weeks

Step-by-step explanation:

70/7= 10

4 0

3 years ago

Read 2 more answers

There are 7 girls on a bus. each girl has 7 backpacks. each backpack has 7 big cats. each big cat has 7 little cats. how many le

Vera_Pavlovna [14]

7 girls on a bus, each has two legs. 7 * 2 = 14.

Each girl has 7 backpacks. So 7 * 7 = 49.

49 * 7 = 343 cats in total

343 * 4 = 1,372 cat legs.

343 * 7 = 2401 small cats

2401 * 4 = 9,604 cat legs

14 + 1,372 + 2,401, + 9,604 = 10,990 legs in total

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3 years ago

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Which type of transformation to the triangle has occurred from graph 1 to graph 2 in this diagram

mel-nik [20]

Answer:

B. Rotation

Step-by-step explanation:

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3 years ago