Mathematics, 25.02.2020 03:48 gabrielmartinsotr4yl

About 1111% of the population of a large country is math phobicmath phobic. If two people are randomly selected, what is the probability both are math phobicmath phobic? What is the probability at least one is math phobicmath phobic?

Answers: 3

Show answers

Answers

Answer from: jwbri

a) $P(X=2) = (2C2) (0.11)^2 (1-0.11)^{2-2}= 0.0121$

b) $P(X=0) = (2C0) (0.11)^0 (1-0.11)^{2-0}= 0.7921$

$P(X \geq 1)= 1-P(X$

Step-by-step explanation:

Previous concepts

The binomial distribution is a "DISCRETE probability distribution that summarizes the probability that a value will take one of two independent values under a given set of parameters. The assumptions for the binomial distribution are that there is only one outcome for each trial, each trial has the same probability of success, and each trial is mutually exclusive, or independent of each other".

Solution to the problem

Part a

Let X the random variable "number of people math phobicmath phobic" , on this case we now that the distribution of the random variable is:

$X \sim Binom(n=2, p=0.11)$

The probability mass function for the Binomial distribution is given as:

$P(X)=(nCx)(p)^x (1-p)^{n-x}$

Where (nCx) means combinatory and it's given by this formula:

$nCx=\frac{n!}{(n-x)! x!}$

And we want this probability:

P(X=2)

If we use the probability mass function we got:

$P(X=2) = (2C2) (0.11)^2 (1-0.11)^{2-2}= 0.0121$

Part b

For this case we want this probability:

$P(X \geq 1)= 1-P(X$

We can find first this probability

$P(X=0) = (2C0) (0.11)^0 (1-0.11)^{2-0}= 0.7921$

$P(X \geq 1)= 1-P(X$

Answer from: Quest

answer:

payment just for service

→

87.12

payment for service including tax

→

94.09

explanation:

service only with 20% tip

→

72.6

(

100

)

87.12

in the opening of the question the word 'service' is associated only with the pretax value.

the closing part of the question asks: how much did she pay for the

service

−−−−−−

so technically the answer is

→

72.6

(

100

)

87.12

however, the intention of the question provider may have been that your answer is to be

87.12

(

100

)

94.09

to 2 decimal places.

payment just for service

→

87.12

payment for service including tax

→

94.09

tony b

mar 21, 2017

answer:

trying to explain it another way

explanation:

service charge

→

72.60

20% tip

100

72.60

14.52

−−−−−−

←

add

87.12

tax

100

87.12

6.97

−−−−−

←

add

94.09

Another question on Mathematics

Mathematics, 21.06.2019 16:20

Plot the points (0,6), (3,15.8), and (9.5,0) using the graphing tool, and find the function

Answers: 2

Answer

Mathematics, 21.06.2019 22:30

An octagonal prism has jow many lateral faces?

Answers: 1

Answer

Mathematics, 21.06.2019 22:30

Given the system of equations presented here: 2x + 4y = 14 4x + y = 20 which of the following actions creates an equivalent system such that, when combined with the other equation, one of the variables is eliminated? multiply the second equation by â’4 to get â’16x â’ 4y = â’80 multiply the second equation by â’1 to get â’4x â’ y = â’20 multiply the first equation by 2 to get 4x + 8y = 28 multiply the first equation by â’1 to get â’2x â’ 4y = â’14

Answers: 1

Answer

Mathematics, 21.06.2019 23:00

Find the equation of the ellipse with the following properties. the ellipse with foci at (0, 6) and (0, -6); y-intercepts (0, 8) and (0, -8).edit: the answer is x^2 over 28 + y^2 over 64 = 1

Answers: 2

Answer

You know the right answer?

About 1111% of the population of a large country is math phobicmath phobic. If two people are random...

Questions