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
Fed [463]
2 years ago
12

A bad contains 15 balls of which X is red. Write an expression for the probability that a ball drawn from the bad is red. When 5

more red balls are added to the bag, the probability becomes 3/4. Find the value of X.

Mathematics
1 answer:
antoniya [11.8K]2 years ago
5 0

Answer:

10

Step-by-step explanation:

The current probability of picking a red ball is \frac{x}{15}. When 5 more balls are added, the probability is 3/4. We can write a ratio for this problem:

\frac{x+5}{15+5} = \frac{3}{4}

When using cross multiplication to solve this, you get 3 * 20 = 4(x+5).

60 = 4x + 20

40 = 4x

x = 10 red balls

You might be interested in
You and three friends are going to Splash Water Park. The park has three water rides. THe Coaster, Slide, and Drop cost $5.50, $
Gelneren [198K]
The slide costs $2 each time you ride. $15/2 = 7.5 so you can ride it 7 times.
5 0
3 years ago
Read 2 more answers
Please help ASAP I can't get it
Ilia_Sergeevich [38]
7 and 21 I believe, hope you get it right
8 0
3 years ago
Tell whether the angles are adjacent or vertical. Then find the value of x.
VMariaS [17]

Answer:

The angles are adjacent. x = 100°

Step-by-step explanation:

x + 80 = 180

x = 100

5 0
2 years ago
PLEASE HELP!
vlabodo [156]

Answer:

D

Step-by-step explanation:

8 0
2 years ago
Read 2 more answers
Suppose that on the average, 8 students enrolled in a small liberal arts college have their automobiles stolen during the semest
Gekata [30.6K]

Answer: 0.9577 ≈ 95.77%

Step-by-step explanation:

This can be solved by the Poisson distribution formula for random variables when the mean outcome of such variables are given.

The Poisson Formula is denoted by :

P(X=K) = e^-λ × (λ^k/k!)

Where e = exponential factor y 2.71828

λ = mean/ average outcome = 8

k = varied outcome.

To find the probability of more than 3,we find the probability of 3 or less, sum it then subtract from 1,that is P(X>3) = 1 - P(X≤3)

When k=0

P(X=0) = e^-8 × (8^0/0!) = 0.000335

When k=1

P(X=1) = e^-8 × (8¹/1!) = 0.00268

When k=2

P(X=2) = e^-8 × (8²/2!) = 0.0107

When k=3

P(X=3) = e^-8 × (8³/3!) = 0.0286

P(X≤3) = 0.00035 + 0.00268 + 0.0107 + 0.0286 = 0.0423

Hence, P(X>3) = 1 - 0.0423 = 0.9577 ≈ 95.77%

7 0
3 years ago
Other questions:
  • The coordinates of the endpoints of ST are (-2,3) and (3, y) respectively supposethe distance between s and t us 13 units.What v
    7·1 answer
  • The proof that ΔACB ≅ ΔECD is shown. Given: AE and DB bisect each other at C. Prove: ΔACB ≅ ΔECD What is the missing statement i
    14·2 answers
  • Examine the lines that are cut by transversals to determine the measure of angle 1.
    11·2 answers
  • A line passes through the point (-7,8) and has a slope of 1
    12·1 answer
  • What is £1871 minus 20%?
    9·1 answer
  • Find the area of each sector
    8·1 answer
  • Probability A survey of a college freshment class has determined that the mean height of females in the class is 64 inches,with
    7·1 answer
  • A box contains 5 red balls, 6 white balls and 9 black balls. Two balls are drawn at
    15·1 answer
  • Please Help!<br> Slope finding<br> 8th Grade work
    7·2 answers
  • Desiree's test scores are 77, 90, 66, and 82.
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!