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Stels [109]
3 years ago
13

A bag contains five white marbles and five black marbles. What is the probability of drawing a white marble, not replacing it, a

nd then drawing a black marble? A. 5/9 B. 1/4 C. 5/18 D. 1/2
Mathematics
1 answer:
Lelu [443]3 years ago
6 0

~ ANSWER=1/2 ~

Simple probability is found by counting all the results which fit requirements and dividing by all possible results.

To find probability of two results in a row, multiply chance of first result by chance of second result.

Since you are replacing the marble before the second draw, we don’t have to figure out the various changes in odds for the different possible first draws. It’s just that simple.

There are 5 white marbles

There are 4 red marbles

There are always 20 marbles in all

5/20*4/20=1/4*1/5=1/20 or 1/2

By coincidence, the same as the chance of drawing the white marble in one draw.

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Answer:

Part 1) The volume of the ball is 256 cm³

Part 2) The radius of the ball is 3.94 cm

Step-by-step explanation:

Part 1) we know that

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The volume is equal to divide the mass by the density

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In this problem we have

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substitute

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Part 2) what is the radius of the ball?

we know that

The volume of the sphere (ball) is equal to

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256=\frac{4}{3}(3.14)r^{3}

768=(12.56)r^{3}

r^{3}=768/(12.56)

r=3.94\ cm

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