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Dimas [21]
3 years ago
15

Suppose I have an urn full of balls.10 balls are balck, 2 are blue,2 are red,1 is green. I reach into the urn and pull out a bal

l and record the colour. I then put it back in the urn. If i do this 10 times calculate
a) the probability I obtain exact 4 black balls
b) The probablility I obtain less than 2 red balls

For clarity we are putting the balls back into the urn after the colour is recorded.
Mathematics
1 answer:
Gelneren [198K]3 years ago
6 0

Answer:

Step-by-step explanation:

Assuming that each draw is independent of the last and that each ball is equally likely to be selected makes this a binomial distribution

a.) first find the probability of selecting a black ball, 2/10 or .2

{10\choose{4}}.2^4*.8^6=.08808384

b.) Probability of slecting a red ball: 1/10 or .1

Less than 2 is X=0 + X=1

{10\choose0}*.2^0*.8^{10}+{10\choose1}*.2*.8^9=.3758096384

i will leave you to do the rounding

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Find the circumference and the area of a circle with radius 3 m.
Effectus [21]

Answer:

\boxed {c= 18.84 \ m}

\boxed {a=28.26 \ m^2}

Step-by-step explanation:

We are asked to find the circumference and area of a circle with a radius of 3 meters.

<h3>1. Circumference </h3>

The circumference is the perimeter of a circle. It is calculated using the following formula:

c= \pi d

We know the radius of the circle is 3 meters, but we must find the radius. The radius is the line from the center to the circle's edge, while the diameter is the line through the center from edge to edge. Therefore, the diameter is twice the radius.

  • d= 2 r
  • d= 2 * 3 m
  • d= 6 m

The diameter is 6 meters and we are using 3.14 for pi. Substitute these values into the circumference formula.

c= (3.14)(6 \ m )

Multiply.

\bold {c= 18.84 \ m}

<h3>2. Area </h3>

The area is the size of the circle's surface. It is calculated using the following formula.

a= \pi r^2

The radius is 3 meters are we are using 3.14 for pi. Substitute these values into the area formula.

a= (3.14)(3 \ m)^2

Solve the exponent.

  • (3 m)² = (3 m)(3 m)= 9 m²

a= (3.14)(9 \ m)^2

\bold {a=28.26 \ m^2}

The circumference is 18.84 meters and the area is 28.26 square meters.

6 0
2 years ago
Can someone help? Thanks! :)
sukhopar [10]

Answer:

<em>The second figure ( rectangle ) has a longer length of it's diagonal comparative to the first figure ( square )</em>

Step-by-step explanation:

We can't confirm the length of these diagonals based on the appearance of the figure, so let us apply Pythagorean Theorem;

This diagonal divides each figure ( square + rectangle ) into two congruent, right angle triangles ⇒ from which we may apply Pythagorean Theorem, where the diagonal acts as the hypotenuse;

5^2 + 5^2 = x^2 ⇒ x is the length of the diagonal,

25 + 25 = x^2,

x^2 = 50,

x = √50

Now the same procedure can be applied to this other quadrilateral;

3^2 + 7^2 = x^2 ⇒ x is the length of the diagonal,

9 + 49 = x^2,

x^2 = 58,

x = √58

<em>Therefore the second figure ( rectangle ) has a longer length of it's diagonal comparative to the first figure ( square )</em>

5 0
2 years ago
Simplify fowllow the order of operarions 12-7+9-2
steposvetlana [31]
12 bro it even says to follow the order of operations. If there is only addition and subtraction you just go from left to right. Same with if there is only multiplication and division.
6 0
3 years ago
Read 2 more answers
(2 1/4) x (-8) <br> FIND THE SUM OF THIS EQUATION
mr Goodwill [35]

Answer:

the answer is 18

Step-by-step explanation:

6 0
3 years ago
Read 2 more answers
6. Blake went to the grocery store at 6:30PM, He returned to his house around 9:14PM after running
zhenek [66]
If you subtract the times periods form each you will be able to get your answer. So, 9:14-6:30 it will be 2 hours and 44 mins because from 6:30 to 7 it 30 mins, and from 7 to 9 it’s 2 hours. So far, add the two and you get 2h and 30mins and from 9 to 9:14 it’s 14 mins. So, 2h 30 mins plus 14 mins is 2h and 44mins.
5 0
3 years ago
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