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3 years ago

Help me pls‼️‼️‼️❤️❤️

Mathematics

2 answers:

Furkat [3]3 years ago

7 0

Answer:

25%

Step-by-step explanation:

1. Find the area of both Circles: $A = \pi r^{2}$ $A = \pi 2^{2}$ = $4\pi$ $A = \pi 1^{2} = \pi$

2. $\frac{\pi }{4\pi }$ to find the percentage

3. 0.25 = 25%

Viktor [21]3 years ago

3 0

Answer:

= 50%

Step-by-step explanation:

There is one point, random number = 1

There are two circles, sample space = 2

${ \tt{probability = \frac{1}{2} }} \\ { \tt{percentage = \frac{1}{2} \times 100\% }} \\ = 50\%$

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Simplify write in factored form

Viktor [21]

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3 years ago

The golf scores for a school team were normally distributed with a mean of 68 and a standard deviation of three. What the probab

Sloan [31]

Answer:

$P(X$

And we can find this probability using the normal standard table or excel and we got:

$P(Z$

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".

Solution to the problem

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

$X \sim N(68,3)$

Where $\mu=68$ and $\sigma=3$

We are interested on this probability

$P(X$

And the best way to solve this problem is using the normal standard distribution and the z score given by:

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

If we apply this formula to our probability we got this:

$P(X$

And we can find this probability using the normal standard table or excel and we got:

$P(Z$

We can use the following excel code to find it: "=NORM.DIST(-1,0,1,TRUE)"

8 0

3 years ago

Help me please I don't understand! 0

yawa3891 [41]

1. Right
2. I forgot how to do that
3. X is 45
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4 years ago

There is a bag with only red marbles and blue marbles. The probability of randomly choosing a blue marble is 2/9 . There are 63

Verdich [7]

Answer:

49 red marbles

Step-by-step explanation:

There is a bag with only red marbles and blue marbles.

We are told in the question that:

The probability of randomly choosing a blue marble is 2/9 . There are 63 marbles in total in the bag

Hence: since

P(Blue marbles) = 2/9

Hence,

The number of blue marbles = 63 ÷ 9

= 7

Hence:

2 × 7/9 × 7 = 14/63

Hence, the number of blue marbles = 14 blue marbles

The number of red marbles bus calculated as:

63 - 14 blue marbles

= 49 red marbles

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3 years ago

What is the measure of angle x?

gayaneshka [121]

You would subtract 180-50
b. 130 degrees

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4 years ago