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3 years ago

6/7 (1/6-4/7) find the difference??

Mathematics

1 answer:

Nadusha1986 [10]3 years ago

4 0

I got -0.3468 because 1/6 - 4/7= -0.40467 and 6/7 times -0.40467= -0.3468
hope i helped

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A population has a mean, μ = 89 and a standard deviation,σ = 24.

Cloud [144]

Answer:

$\bar X \sim N(\mu=89, \frac{24}{\sqrt{64}}=3)$

Step-by-step explanation:

Previous concepts

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

Solution to the problem

Let X the random variable of interest for a population. We know from the problem that the distribution for the random variable X is given by:

$X\sim N(\mu =89,\sigma =24)$

We take a sample of n=64 . That represent the sample size.

The sample mean is defined as:

$\bar X = \frac{\sum_{i=1}^n X_i}{n}$

And if we find the expected value and variance for the sample mean we got:

$E(\bar X) = \mu$

Var(\bar X) = \frac{\sigma^2}{n}[/tex]

The distribution for the sample mean is given by:

$\bar X \sim N(\mu, \frac{\sigma}{\sqrt{n}})$

$\bar X \sim N(\mu=89, \frac{24}{\sqrt{64}}=3)$

3 0

2 years ago

What is the surface area of the right cylinder below?

IgorLugansk [536]

Answer:

Ok to find the surface area of this cylinder first we need the circumference to find this we do C=πd

C=3.14*18

C=56.52

now we have to multiple this by the height of two

113.04

now we have to find the area of the bottom to do this we do A=πR^2

A=3.14*81

A=254.34

multiple this by two for the two sides we get

508.68

now we add this to 113.04 we get

621.72

since I used 3.14 instead of more digits of pie we can round this up so the answer is C.

Your Welcome

BIFFY OUT!!!

8 0

2 years ago

Select all the answers !

ki77a [65]

Answer:

1,3 and 4

it is what it be

3 0

2 years ago

Write another way to represent 3^-5

Dmitrij [34]

4x10^-3 is another way to represent 3^-5

3 0

2 years ago

Read 2 more answers

1. How many times greater is the value of the 6 in 9,638 than the value of the 6 in 3,968?

Oksana_A [137]

Answer:

100 times

Step-by-step explanation:

doesn't matter if the number is in the same place value so, the answer is 100 times.

6 0

3 years ago