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2 years ago

Hi, can you help me with this probability question?

Mathematics

1 answer:

AURORKA [14]2 years ago

6 0

the probability of getting a black one given that in the first draw we got a black one is P = 1/2 = 0.5

<h3>How to find the probability?</h3>

We will assume that all the beads have the same probability of being randomly selected.

Then the probability of picking a black bead is equal to the quotient between the number of black beads and the total number of beads.

Originally, there are 4 black ones and 3 red ones ( a total of 7).

We want to get the probability of getting a black one given that in the first draw we got a black one.

If in the first draw we got a black one, then now there are 3 blacks and 3 reds (a total of 6 beads).

So the probability of getting another black one is:

P = 3/6 = 1/2 = 0.5

If you want to learn more about probability:

brainly.com/question/251701

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. The ratio of the area of circle A to the area of circle B is 12/5. What is the ratio of their circumferences?

N76 [4]

Answer:

1.5

Step-by-step explanation:

a : b = 1 : 12/5

Area of a circle = πr²

Where : = π = pi = 22/7

R = radius

Let the radius of circle a = 1

Area of circle A = 1π

Radius of circle A = square root of 12/5 = 1.5

The circumference of a circle = 2nr

n = 3.14

circumference of circle A = 2 x n x 1 = 2n

circumference of circle B = 2 x n x 1.5 = 3n

ratio of circumference = 3n / 2n = 1.5

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3 years ago

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3 years ago

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Four times a number is added to 5. The sum is then divided by 6. The result is 7/2. Find the number.

bogdanovich [222]

Hi!

The set up for the question is like this:

$\frac{4x + 5}{6} = \frac{7}{2} \\2*(4x + 5) = 7*6\\8x + 10 = 42\\8x = 42 - 10 = 32\\x = 32/8\\x = 4$

Hope this helps!

8 0

3 years ago

If 24 ÷ b = 12, which number is being subtracted 12 times in order for the answer to be zero?

mariarad [96]

Answer:

Step-by-step explanation:

Notice the question of which number is being subtracted 12 times in order for the answer to be zero is the same as finding b.

Notice 24 is being divided by b to get 12 as result.

The question is then: by what number we divide 24 to get 12?

It is 2 since:

$24\div2=12$

And notice if we subtract 12 times b from 24 we actually get 0:

$24-12\cdot2 = 24-24=0$

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4 years ago

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Svet_ta [14]

Answer: the answer is 46

Step-by-step explanation:

i added them all together

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3 years ago

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