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
If the tank is then field to capacity how many half-gallon bottles how many cords will it make?
lukranit [14]

Answer:

Divide 12 by 4 first to figure out how many gallons are in each 1/4 of the tank. 

12/4=3

So if I added another 1/4 to the capacity:

It could hold 15 gallons. 

All you have to do to find how many half bottles can be filled is to times 15 by two since we are filling half gallon bottles.

15x2=30

30 bottles.

6 0
3 years ago
A group of people want to buy tickets to a baseball game. At least 18 people need to buy tickets in order to get the group rate.
borishaifa [10]

Answer:

a or b

Step-by-step explanation:

it should be p≥18

greater then or equal to 18. because if you have 18, you can get the group rate and I'd you have more than 18 you can also get the group rate.

4 0
3 years ago
Which function is undefined when theta=pi/2 radians?
olchik [2.2K]

tan ∅ and cot ∅

tan ∅ is undefined for ∅ = \frac{\pi }{2}

and since cot ∅ = 1/ tan ∅ then cot ∅ is also undefined for ∅ = \frac{\pi }{2}

8 0
3 years ago
Read 2 more answers
Can u help me solve this showing the work please
Leviafan [203]
4 divides by 2,626 equals 656.5

8 0
2 years ago
PLEASE HELP!!!
Xelga [282]

Answer:

increase the budget

Step-by-step explanation:

The decision has to be increase the budget for the indoor rock climbing facility.

Reason -

By dividing each number by 2 we get equal resukt.

7 0
2 years ago
Other questions:
  • If anyone can help with this pls do! i need to get this right thank u!
    8·2 answers
  • 1. What is the arithmetic mean of the numbers 14,16,18,5,17 ?
    10·2 answers
  • At a bake sale there were 72 raisin cookies sold. if the ratio of raisin cookies sold to oatmeal cookies sold was 9:1, what is t
    11·1 answer
  • Please help me simplify this rational expression
    11·1 answer
  • When 25 students went to Washington dc 18 of them visited the museum of natural history and 22 visited the natural air and space
    10·1 answer
  • A large rectangle is made by joining three identical small rectangles as shown.
    8·1 answer
  • Find 136.7% of 301. Round to the nearest hundredth.
    13·1 answer
  • PLS HELP ASAP SHOW EXPLANATION WILL GUVE BRAINLIEST
    15·1 answer
  • A rectangular yard measures 12 feet by 10 feet. Find the cost of installing a fence around the yard if the fence costs
    9·1 answer
  • Eric has 72 stickers to give to S
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!