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
Aleksandr [31]
3 years ago
15

Assume that when adults with smartphones are randomly selected, 35% use them in meeting or classes. if 7 adults smartphones user

s are randomly selected, find the probability that exactly 4 of them use their smartphones in meeting or classes.
The probability is
Mathematics
1 answer:
likoan [24]3 years ago
7 0
This is a binomial probability problem
p = 0.35 = chance of picking 1 person who uses smartphones during meeting/class

n = 7 = sample size

k = 4 = target number of people who use their smartphone

Compute nCk = 7C4 using the nCr combination formula

nCr = (n!)/(r!*(n-r)!)
7C4 = (7!)/(4!*(7-4)!)
7C4 = (7*6*5*4!)/(4!*3!)
7C4 = (7*6*5)/(3!)
7C4 = (210)/(6)
7C4 = 35

Use this coefficient to find the binomial probability
B(k) = binomial probability for input k
B(k) = (nCk)*(p^k)*(1-p)^(n-k)
B(4) = (7C4)*(0.35^4)*(1-0.35)^(7-4)
B(4) = 35*(0.35^4)*(0.65)^3
B(4) = 0.144238

So the approximate answer is 0.144238
This value is accurate to 6 decimal places



You might be interested in
A driver travels the first 240 km of a 600-km journey at an average speed of 60 km/h. If the time taken for the whole journey is
denpristay [2]

Step-by-step explanation:

1)Take the time he is traveling divided by the speed to get the time.

2)Subract the time you have got from the average time,then subtract the average distance from the traveling distance,then divide the two to get the speed.

3)Take the total distance, divide it by the total time to get the average speed.

8 0
2 years ago
Help and explain explain !!!!!!!!!!
tigry1 [53]

Answer:

x=-1\text{ or }x=11

Step-by-step explanation:

For a=|b|, we have two cases:

\begin{cases}a=b,\\a=-b\end{cases}

Therefore, for 18=|15-3x|, we have the following cases:

\begin{cases}18=15-3x,\\18=-(15-3x)\end{cases}

Solving, we have:

\begin{cases}18=15-3x, -3x=3, x=\boxed{-1},\\18=-(15-3x), 18=-15+3x, 33=3x, x=\boxed{11}\end{cases}.

Therefore,

\implies \boxed{x=-1\text{ or }x=11}

3 0
2 years ago
H E L P<br> what is the slope??
earnstyle [38]
1/3 is the slope
X= 12-6=6
Y= 4-2=2
I got the slope 1/3 I used the points (6,2), (12.4)
7 0
3 years ago
Help
Art [367]

\huge\fbox{Answer ☘}

\bold{3( \frac{27}{8} ) {}^{ \frac{2}{3}  \times  - 1}  = 2( \frac{32}{243} ) {}^{2x} }\\  \\3(( \frac{3}{2} ) {}^{3} ) {}^{ \frac{2}{3} \times  - 1 }  = 2(( \frac{2}{3} ) {}^{5} ) {}^{2x}  \\\\ 3( \frac{3}{2} ) {}^{2 \times  - 1}  = 2( \frac{2}{3} ) {}^{10x}  \\\\ 3( \frac{2}{3} ) {}^{2}  = 2( \frac{2}{3} )  {}^{10x}  \\\\ 3( \frac{4}{9} ) = 2( \frac{4}{9} ) {}^{5x}  \\\\\bold\pink{ comparing \: powers }\\\\5x = 1 \\\\ \bold\blue{x =  \frac{1}{5} }

hope helpful~

5 0
2 years ago
If 3^2x+1=3^x+5 what is the value of x
Diano4ka-milaya [45]
The answer to this question would be 4
4 0
1 year ago
Other questions:
  • The park’s main attraction will be the roller coaster Scream Mountain, which will be designed to be fast and fun, but still secu
    9·1 answer
  • Mari has 28 wooden cubes. She wants to stack them to form a triangle. Each row will have one fewer than the row below it. How ma
    7·2 answers
  • Which series of transformations shows that heptagon A is congruent to heptagon B?
    12·1 answer
  • The heights (in inches) of the starting players on a high school basketball team are as follows: 72, 75, 78, 72, 73. how many pl
    6·1 answer
  • Describe relathionship between the values of given digits. The 6's in 6600
    9·1 answer
  • (2x+8)+(71-x)=180 what is the x
    10·1 answer
  • Suppose one of your friends was absent from school on the day your math class learned about graphing rational numbers on the num
    6·2 answers
  • What ratio is equivalent to 4:10 choose all that apply
    8·1 answer
  • Could u help me please?
    10·2 answers
  • 4.) You have saved $2000 for college and are saving at the rate of $250 per month. Assume
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!