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Sati [7]
2 years ago
9

Twice the sum of a number and 11 is 34. What is the number?

Mathematics
2 answers:
cupoosta [38]2 years ago
4 0

28

34 ay 17. So 11 + 17 = 28

cricket20 [7]2 years ago
4 0

Answer:

Twice the sum of 11.5 and 11 is 34.

Step-by-step explanation:

Twice the sum of a number and 11 is 34.

This implies the equation:

2x+11=34 -> Solve for X.

34-11=23.

23/2=11.5

X=11.5

Could also use Desmos calculator for this, in which it would look like:

<em><u>(Brainliest?)</u></em> ^^

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Lemur [1.5K]

Answer:

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And we can find this probability like this:

P(-1.1 \leq Z \leq 1.1)= P(Z\leq 1.1) -P(Z\leq -1.1) = 0.864-0.136= 0.728

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P(X

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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".

The Z-score is "a numerical measurement used in statistics of a value's relationship to the mean (average) of a group of values, measured in terms of standard deviations from the mean".  

Continuity correction means that we need to add and subtract 0.5 before standardizing the value specified.

Part a

Let X the random variable that represent the variable of interest of a population, and for this case we know the distribution for X is given by:

X \sim N(25,5)  

Where \mu=25 and \sigma=5

Part a

For this case we want to find this probability:

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And if we use the z score given by:

z =\frac{x-\mu}{\sigma}

We got this:

P(19.5 \leq X \leq 30.5) = P(\frac{19.5-25}{5} \leq Z \leq \frac{30.5 -25}{5})=P(-1.1 \leq Z \leq 1.1)

And we can find this probability like this:

P(-1.1 \leq Z \leq 1.1)= P(Z\leq 1.1) -P(Z\leq -1.1) = 0.864-0.136= 0.728

Part b

For this case we want this probability:

P(X \leq 30)

And if we use the continuity correction we got:

P(X \leq 30)= P(X

And using the z score we got:

P(X

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For this case we want this probability:

P(X

And if we use the continuity correction we got:

P(X

3 0
3 years ago
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vagabundo [1.1K]

Answer:

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Step-by-step explanation:

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P( second red ) = \frac{2}{7}

P( red and red ) = \frac{3}{8}  × \frac{2}{7} = \frac{6}{56} = \frac{3}{28}

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