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Tatiana [17]
4 years ago
13

A bag contains 8 white marbles and 2 black marbles.you pick out a marble, record its color,and put the marble back in the bag.if

you repeat this process 45 times, how many time would you expect to remove a white marble from the bag?
Mathematics
2 answers:
kondaur [170]4 years ago
3 0
Many time omggg this is anoying to have to do that
Nadya [2.5K]4 years ago
3 0
I believe it's easiest to look at the percentages

8/10 marbles are white which is 80%

so it would follow that on average 80% of the 45 marbles would be white.

Which is 36 marbles.
You might be interested in
Mary crocheted a rectangular blanket whose diagonal measures approximately 7.21 feet. What are the most likely length and width
mote1985 [20]

Answer:

If both sides are integers, one side will be 4 feet and the other will be 6 feet. The other solution is the symmetrical solution (4 feet instead of 6 feet, and 6 feet instead of 4 feet).

Step-by-step explanation:

We have a rectangular blanket, that has a diagonal that measures h=7.21 feet.

The two sides of the rectangle a and b can be related to the diagonal h by the Pithagorean theorem:

a^2+b^2=h^2

Then, we can express one side in function of the other as:

a^2+b^2=h^2\\\\a^2=h^2-b^2\\\\a=\sqrt{h^2-b^2}=\sqrt{7.21-b^2}=\sqrt{52-b^2}

Then, if we define b, we get the value of a that satisfies the equation.

A graph of values of a and b is attached.

If both side a and b are integers, we can see in the graph that are only two solutions: (b=4, a=6) and (a=4, b=6).

8 0
3 years ago
Write an equation for this math problem
mote1985 [20]

Answer:

0 + 5 - 10

Step-by-step explanation:

You move five spaces forward and ten spaces backwards

7 0
3 years ago
Ethan has $150. He wants to buy 4 identical bouquets of flowers but he needs to have at least $20 left after buying the flowers.
pochemuha
150-4x>=20
-4x>=-130
X>=32.5
7 0
3 years ago
Solve for t<br><br> - 7/4 = 2/5 (t)<br><br> t=
Lena [83]
-7/4:-1.75
2/5:0.4
-1.75=0.4t
-1.75/0.4=t
-4.375=t

Hope I helped you well, have a victorious day!
4 0
3 years ago
Simplify 3√125. Thanks!
ivann1987 [24]
If you mean
3 times square root of 125 then go to AAA
if you mean ∛125 then go to BBBB


AAAAAA
3 times √125=3 times 5√5=15√5

BBBBBBB
∛125=5 or -5
5 0
4 years ago
Read 2 more answers
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