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3 years ago

Numărul numerelor naturale mai mari decât 10 puterea 3

Mathematics

1 answer:

Evgen [1.6K]3 years ago

4 0

mark me as brainlist thank you

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The mean number of words per minute (WPM) typed by a speed typist is 149149 with a standard deviation of 1414 WPM. What is the p

Semmy [17]

Answer:

The probability is $P(\= X > x ) = 0.78814$

Step-by-step explanation:

From the question we are given that

The population mean is $\mu = 149$

The standard deviation is $\sigma = 14$

The random number $x = 147.81$

The sample size is $n = 88$

The probability that the sample mean would be greater than $P(\= X > x ) = P( \frac{ \= x - \mu }{\sigma_{\= x} } > \frac{ x - \mu }{\sigma_{\= x} } )$

Generally the z- score of this normal distribution is mathematically represented as

$Z = \frac{ \= x - \mu }{\sigma_{\= x} }$

Now

$\sigma_{\= x } = \frac{\sigma }{\sqrt{n} }$

substituting values

$\sigma_{\= x } = \frac{14 }{\sqrt{88} }$

$\sigma_{\= x } = 1.492$

Which implies that

$P(\= X > x ) = P( Z > \frac{ 147.81 - 149 }{ 1.492} )$

$P(\= X > x ) = P( Z > -0.80 )$

Now from the z-table the probability is found to be

$P(\= X > x ) = 0.78814$

5 0

3 years ago

PLEASE HELP! I NEED HELP Use synthetic division!

Vaselesa [24]

It’s the first one - 3x^2 - 3x+8 - 9/x+1

3 0

3 years ago

3 to the x power - 1 = 9 to the x power+2

Tom [10]

So we need to solve:

3ˣ⁻¹ = 9ˣ⁺²

To do this, we need to have the same base for both sides of the equation.

So let's go with the base of 3.

3² = 9

3ˣ⁻¹ = (3²)ˣ⁺²

3ˣ⁻¹ = 3²ˣ⁺⁴

Since the bases are the same now, we need to get rid of them and we would get:

x - 1 = 2x + 4

Subtract both sides by 2x:

-x - 1 = 4

Add 1 to both sides:

-x = 5

Divide both sides by -1:

x = -5

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3 years ago

In the triangle below which of the following best describes dh

siniylev [52]

Looks like an angle bisector to me

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3 years ago

Round the fraction to the nearest whole or half.<br> 8/14

Elina [12.6K]

The answer to this question is 7/14.

7 0

4 years ago

Read 2 more answers