1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Kamila [148]
3 years ago
8

Amy has a box containing 6 white, 4 red, and 8 black marbles. She picks a marble randomly. It is red. The second time, she picks

a white marble. In the third attempt, Amy picks a white marble again. Amy has not replaced the marbles she picked. The probability that the fourth marble Amy picks is black is . If Amy picks a black marble in the fourth attempt, the probability that in the fifth attempt she will pick a red or a black marble is____.
Mathematics
1 answer:
Sladkaya [172]3 years ago
6 0
After the 3rd pick we have: 4 white, 3 red and 8 black marbles.
The probability that the 4th marble is black is:
P ( Black ) = 8 / 15 = 0.5333
After the 4th pick we have: 4 white, 3 red and 7 black marbles.
P ( Red or Black ) = 10 / 14 = 5 / 7 = 0.7143
You might be interested in
An actor invested some money at 5% simple interest, and $41,000 more than 4 times the amount at 9%. The total annual interest ea
NARA [144]

Answer:

  • The amount invested at 5%=$77,000
  • The amount invested at 9%=$349,000

Step-by-step explanation:

  • Let the amount invested at 5% simple interest =$x

He invested $41,000 more than 4 times the amount at 9%.

  • This amount is: $(4x+41000)

Total Annual Interest Earned = $35,260

Therefore, Time=1 year

Simple Interest=\frac{Principal X Rate X Time}{100}

Therefore, his total interest

=Interest from Investment 1 + Interest from Investment 2

35260=\left(\frac{x*5*1}{100} \right)+\left(\frac{4x+41000*9*1}{100} \right)\\35260=0.05x+(0.36x+3690)\\35260-3690=0.05x+0.36x\\31570=0.41x\\\text{Divide both sides by 0.41}\\x=\$77000

Therefore:

The amount invested at 5%=$77,000

The amount invested at 9%=$(4*77,000+41000)=$349,000

6 0
3 years ago
Sierra applies a coat of epoxy paint to the four sides and floor of a rectangular swimming pool. The pool is 4 feet deep, 18 fee
Brilliant_brown [7]

Answer:

4 gallons of paint

Step-by-step explanation:

We solve using the formula for surface area of rectangular prism.

A=2(wl+hl+hw)

Where:

w = Width

h = Height

l = Length

The pool is 4 feet deep, 18 feet long, and 12 feet wide.

Hence,

=2 × (12 × 18 + 4 × 18 + 4 ×12)

=672 square feet

One gallon of paint covers 155 square feet.

Hence,

155 square feet = 1 gallon of paint

672 square feet = x

Cross Multiply

155 square feet × x = 672 square feet × 1 gallon of paint

x = 672 square feet × 1 gallon of paint/ 155 square feet

x = 4.335483871 gallons of paint

Therefore, based on the calculation above, approximately to the nearest whole number, Sierra uses 4 gallons of paint

4 0
3 years ago
Students at the college are allowed to work on campus
Ahat [919]

Answer: theres a website called weegy did you try that?

5 0
4 years ago
HELP PLEASE!!!
Hitman42 [59]

Answer:

1. false

2. 17 times

Step-by-step explanation:

The sum of all the probabilities of outcomes of an event is equal to 1

2.  A die has  1,2,3,4,5,6

P(4) = number of 4's/ total numbers

       = 1/6

Multiply the number of roll's by the probability of getting a 4

100 *1/6 = 50/3 = 16 2/3

This is approximately 17

3 0
4 years ago
some poeple where asked which there favourite school subject was, from a choiceof maths, english and science. how many people in
Sedaia [141]

Answer:

IS THERE MORE TO THE PROBLEM? NOT ENOUGH INFORMATION IS GIVEN

Step-by-step explanation:

5 0
3 years ago
Other questions:
  • The inside wheels of a car traveling on a circular path are rotating half as fast as the outside wheels. The front two wheels ar
    9·1 answer
  • Write the equation of each line in slope-intercept form.<br> (If possible please show work)
    13·1 answer
  • If g(x) = -3x + 12, what is the solution set<br> if the domain of gis (-2, 0,2}?
    6·1 answer
  • A surveyor is standing 118 feet from the base of the Washington Monument. The surveyor measures the angles between the ground an
    7·1 answer
  • Can somebody help me with this please
    6·2 answers
  • Hi everyone,Can someone please explain me these I am confused I really need help if you can help please help me.
    5·2 answers
  • 90 POINTS help ASAP.
    7·2 answers
  • How many triangles can the polygon below be divided into? A polygon with 10 sides. 6 7 8 9
    15·1 answer
  • Help! To solve this system of equations by elimination, what operatfon could be used to eliminate the x-variable and find the va
    13·1 answer
  • 7) If you can buy 4 tulip bulbs for $8<br> then how many<br> bulbs can you buy with $32?
    9·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!