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
svet-max [94.6K]
3 years ago
11

You flip a fair coin 7 times. What is the probability that the coin lands with the heads side up exactly 3 out of the 7 times?

Mathematics
1 answer:
Liono4ka [1.6K]3 years ago
5 0

Answer:

  35/128 ≈ 0.2374

Step-by-step explanation:

The number of combinations of 7 things taken 3 at a time is ...

  7·6·5/(3·2·1) = 7·5 = 35

The number of sequences in which the coins can land is 2^7 = 128.

Of those 128 sequences, 35 will have exactly 3 heads.

The probability is 35/128.

You might be interested in
Help me pls
mylen [45]
The smallest number of crackers she can pack is 24.

3 0
1 year ago
Find the 9th partial sum of the geometric sequence an=43n–1.
siniylev [52]

Answer:

39364.

Step-by-step explanation:

I guess its an = 4*(3)^(n-1)

r = 3, a1 = 4 and n = 9

Sum of n terms = a1 * (r^n - 1) / (r - 1)

so S9 = 4 *(3^9 - 1) / (3 - 1)

= 4 * (19683  - 1) / 2

= 78728/2

= 39364.

7 0
2 years ago
What is the value of the x variable in the solution to the following system of equations? 4x + 2y = 12 x – y = 3
Dmitrij [34]

Answer:

all work is shown and pictured

3 0
3 years ago
What are all of these answers?
mina [271]

20

106

1573

53400

dfsgdjkhlkfjg

hope this helps X D

5 0
3 years ago
Read 2 more answers
Question
puteri [66]

Answer:

The salt concentration of the mixed solution = 10%

Step-by-step explanation:

First assuming that the concentration of salt given is on a vol% basis.

First solution has 0.7 gallon of 5% salt

Amount of salt in this solution = 5% × 0.7 = 0.035 gallon

Second solution has 0.3 gallon of 22% salt

Amount of salt in this solution = 22% × 0.3 = 0.066 gallon

Total amount of salt in the resulting solution = 0.035 + 0.066 = 0.101 gallon

Total volume of the resulting solution = 0.7 + 0.3 = 1.00 gallon

Concentration of the mixture of salt = (0.101/1) = 0.101 = 10.1% = 10% to the nearest percent

Hope this Helps!!!

3 0
3 years ago
Other questions:
  • A manufacturer is shipping a certain material in boxes which are 24 inches long, 16 inches wide and 12 inches high. The boxes, w
    12·1 answer
  • Susie has a ribbon that is 44 inches long. She wants to cut it in two pieces so that once piece is 6 inches longer than the othe
    7·1 answer
  • What is 23 3/8 as a percent
    8·1 answer
  • From 1-10, if a number is picked at random, what is the probability of obtaining an odd number?
    11·2 answers
  • Payton cut out two shapes, as shown, that she will later put together to resemble a house. What is the total area of the two sha
    8·2 answers
  • Determine whether each of the following triangles is a right-angled triangle
    7·1 answer
  • EASY BRAINLIEST PLEASE HELP!!
    10·2 answers
  • Krutika was thinking of a number. Krutika halves the number and gets an answer of 86. Form an equation with
    5·1 answer
  • Convert the expression (√5)(∛5) to exponential form. Show your work.
    6·1 answer
  • Round 67,789.233 to the nearest thousand.
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!