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3 years ago

I neep help!!! what is the answer???

Mathematics

2 answers:

Dima020 [189]3 years ago

8 0

Answer:

Your answer will be letter c

Step-by-step explanation:

luda_lava [24]3 years ago

5 0

The answer is c :))))

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Given a normal population which has a mean of 110 and a standard deviation of 5, find the probability that a random sample of 49

Mrac [35]

Answer:

0.9168

Step-by-step explanation:

From the data given:

Mean = 110

standard deviation = 5

Let consider a random sample n =49 which have a mean between 109 and 112.

The test statistics can be computed as:

$Z_1 = \dfrac{x- \bar x}{\dfrac{\sigma}{\sqrt{n}}}$

$Z_1 = \dfrac{109- 110}{\dfrac{5}{\sqrt{49}}}$

$Z_1= \dfrac{-1}{\dfrac{5}{7}}$

$Z_1$ = -1.4

$Z_2= \dfrac{x- \bar x}{\dfrac{\sigma}{\sqrt{n}}}$

$Z_2 = \dfrac{112- 110}{\dfrac{5}{\sqrt{49}}}$

$Z_2 = \dfrac{2}{\dfrac{5}{7}}$

$Z_2 =2.8$

Thus; P(109 < $\overline x$ < 112) = P( - 1.4 < Z < 2.8)

= P(Z < 2.8) - P( Z < -1.4)

= 0.9974 - 0.0806

= 0.9168

8 0

3 years ago

Consider the probability distribution shown below. x 0 1 2 P(x) 0.15 0.80 0.05 Compute the expected value of the distribution. (

larisa [96]

Answer:

Expected value =0.9

Standard deviation = 0.4359

Step-by-step explanation:

Let's use the formula to find expected value or mean.

Expected value =Σ x *P(x)

x 0 1 2

P(x) ) .15 .8 .05

So, expected value = (0)(0.15) +1(0.8)+2(0.05)

= 0 +0.8 +0.1

=0.9

Expected value =0.9

Now, let's find standard deviation

x $(x- E(x))^{2}$ $(x-E(x))^{2} *p(x)$

0 $(0-0.9)^{2}$ $(0-0.9)^{2} *0.15$ =0.1215

1 $(1-0.9)^{2}$ $(1-0.9)^{2} *0.8$ =0.008

2 $(2-0.9)^{2}$ $(2-0.9)^{2} *0.05$ =0.0605

Now, add the last column together and then take square root to find standard deviation.

Standard deviation of the distribution = $\sqrt{0.1215+0.008+0.0605)}$

Simplify it, so standard deviation =0.4358898...

Round the answer to nearest four decimal places

Standard deviation = 0.4359

7 0

3 years ago

A line is parallel to y=4x-2 and intersects the point (-1, -2) what is the equation of this parallel line?

Tema [17]

Answer:

y = 4x + 2

Step-by-step explanation:

Please let me know if you want me to add an explanation as to why this is the answer. I can definitely do that, I just wouldn’t want to write it if you don’t want me to :)

8 0

3 years ago

Suppose the time it takes for a purchasing agent to complete an online ordering process is normally distributed with a mean of 8

Luba_88 [7]

Answer: 0.4

Step-by-step explanation:

We know that the standard deviation of the sampling distribution of mean is given by:-

$\sigma_x=\dfrac{\sigma}{\sqrt{n}}$

Given : Standard deviation : $\sigma= 2\text{ minutes}$

Sample size : n= 25

Then, the standard deviation of the sampling distribution of mean times will be :-

$\sigma_x=\dfrac{2}{\sqrt{25}}\\\\\Rightarrow\ \sigma_x=\dfrac{2}{5}=0.4$

Hence, the standard deviation of the sampling distribution of mean times=0.4

7 0

3 years ago

IF YOU HELP I'LL MARK AS BRAINLIEST

11111nata11111 [884]

Answer:

A is reflected over the y axis and translated 2 units up and 2 units to the right.

Translate is the math word for slide

7 0

3 years ago

Read 2 more answers