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monitta
3 years ago
7

An urn contains 6 red and 7 black balls. 4 balls are randomly drawn from the urn in succession, with replacement. That is after

each draw, the selected ball is returned to the urn. What is the probability that all 4 balls drawn from the urn are black ? Round your answer to three decimal places.
Mathematics
1 answer:
Nataly [62]3 years ago
7 0

Answer:

0.538

Step-by-step explanation:

There are 13 balls in the urn

  • 7 are black and 6 are red

There are 7 chances out of 13 to pick a black ball

  • 7/13
  • 7 ÷ 13 = 0.53846.....

Round and get:

  • <u>0.538</u>
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How to change 7/10 to a percent
Ulleksa [173]

Answer:

70%

Step-by-step explanation:

since 7/10 is 0.7 as a decimal

you can then turn it into a percent by moving the decimal point two spots to the right

70 --> 70%

another way to do it is, to add zeros on both the numerator and denominator

then it is valued at 70/100

a percent is a number over 100

70 ---> 70%

your answer is 70%

hope this helps

7 0
2 years ago
How many roots does a quadratic have if the discriminant if prime?
scZoUnD [109]

"The discriminant is prime?" I haven't heard that one before.

Here are the general rules:

1. a positive discriminant results in two real, unequal roots.

2. a zero discr. results in two real, equal roots.

3. a negative discr. results in two complex roots, which sometimes means two imaginary roots.

5 0
3 years ago
Dan will be 8X years next year. how old was Dan five years ago. give your answer in terms of X
morpeh [17]
If Dan is 8x years old next year then he must be 8x-1 years old this year
With the same logic, five years ago from this year, he must be 8x-1-5=8x-6

The answer should be 8x-6
6 0
3 years ago
7/10-1/2=<br> what is seven tenths minus one half
Setler [38]
You could make them have the same denominator, making it 7/10-5/10=2/10. 
The answer is 2/10, or simplified, 1/5.
5 0
3 years ago
By what number (5/4)^6 should be divided to get (25/16)^8?
Naya [18.7K]

Answer:

X=(5/4)^-10

Step-by-step explanation:

(5/4)^6÷x=(25/16)^8

(5/4)^6÷x=(5/4)^16

1/X==(5/4)^16÷(5/4)^6

X=(5/4)^6÷(5/4)^16

X=(5/4)^-10

So the value of X is (5/4)^-10

6 0
3 years ago
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