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
lilavasa [31]
3 years ago
5

What should I buy? A study conducted by a research group in a recent year reported that of cell phone owners used their phones i

nside a store for guidance on purchasing decisions. A sample of cell phone owners is studied. Round the answers to four decimal places.
Mathematics
1 answer:
Llana [10]3 years ago
7 0

Answer:

The probability that seven or more of them used their phones for guidance on purchasing decisions is 0.7886.

<em />

Step-by-step explanation:

<em>The question is incomplete:</em>

<em>What should I buy? A study conducted by a research group in a recent year reported that 57% of cell phone owners used their phones inside a store for guidance on purchasing decisions. A sample of 14 cell phone owners is studied. Round the answers to at least four decimal places. What is the probability that seven or more of them used their phones for guidance on purchasing decisions? </em>

We can model this as a binomial random variable, with p=0.57 and n=14.

P(x=k)=\dbinom{n}{k} p^{k}q^{n-k}

a) We have to calculate the probability that seven or more of them used their phones for guidance on purchasing decisions:

P(x\geq7)=\sum_{k=7}^{14}P(x=k)\\\\\\

P(x=7)=\dbinom{14}{7} p^{7}q^{7}=3432*0.0195*0.0027=0.1824\\\\\\P(x=8) = \dbinom{14}{8} p^{8}q^{6}=3003*0.0111*0.0063=0.2115\\\\\\P(x=9) = \dbinom{14}{9} p^{9}q^{5}=2002*0.0064*0.0147=0.1869\\\\\\P(x=10) = \dbinom{14}{10} p^{10}q^{4}=1001*0.0036*0.0342=0.1239\\\\\\P(x=11) = \dbinom{14}{11} p^{11}q^{3}=364*0.0021*0.0795=0.0597\\\\\\P(x=12) = \dbinom{14}{12} p^{12}q^{2}=91*0.0012*0.1849=0.0198\\\\\\P(x=13) = \dbinom{14}{13} p^{13}q^{1}=14*0.0007*0.43=0.004\\\\\\

P(x=14) = \dbinom{14}{14} p^{14}q^{0}=1*0.0004*1=0.0004\\\\\\

P(x\geq7)=0.1824+0.2115+0.1869+0.1239+0.0597+0.0198+0.004+0.0004\\\\P(x\geq7)=0.7886

You might be interested in
Select all that are equal to 5³x 5⁻⁷
AnnyKZ [126]

Answer:

The third and fifth are correct

The second one is NOT correct

8 0
3 years ago
Read 2 more answers
The approximate areas of Georgia and South Carolina are listed below:
eimsori [14]

Answer:

Step-by-step explanation:

3 0
2 years ago
The table shows the cost for taxi rides of various distances. Cost of Taxi Rides Distance, Cost, in miles (x) in dollars() 5 16
qaws [65]

Answer:

The real answer to this question is B

Step-by-step explanation:

I made a 100 on my quiz

8 0
3 years ago
Read 2 more answers
¿Se puede distribuir el exponente de una suma o una resta? ¿Y la raiz?
azamat
Si se puede distribuir el exponente de una suma porque si 2+3 elevado al 2 entonces el Raiz seria cuadrada de 19
6 0
2 years ago
Is order of operations and number of operations the same thing?
KonstantinChe [14]
No order of operations is what you might know as Pemdas ,number of Operations is something iv'e never heard of.
7 0
3 years ago
Read 2 more answers
Other questions:
  • 3 numbers between 80 and 90 that are semi prime
    7·1 answer
  • This is hard, but I really need help!
    8·1 answer
  • A jar of olives had a circumference of 11.99 cm. what was the approximate diameter of the jar?
    12·1 answer
  • 12,14,18,26,42 what are the next 2 numberso in the sequence
    10·2 answers
  • Transtutors the town barber shop can accommodate 35 customers per day. the manager has determined that if two additional barbers
    15·1 answer
  • Solve: negative 1 over 2 x + 2 = −x + 7 (5 points)
    7·1 answer
  • Anton's family drove 216 mi to the lake averaging 48 ​ mi/h ​ . On the return trip home they averaged 54 mi/h .
    8·1 answer
  • Find the total surface area of a cylinder with a diameter of 11 meters and a height of 11 meters. Round to the nearest tenths pl
    10·1 answer
  • Write an equation in slope-intercept form that passes through (-6,-2) and had a y-intercept located at y=-5
    14·1 answer
  • PLEASE HELP! 14 POINTS AND PHOTOT ATTACHED!! A tower that is 103 feet tall cast to shadow 120 feet long. Find the angle of eleva
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!