Answer:
(B) Mean 3 and standard deviation 5
Step-by-step explanation:
Property of mean
The mean of the sum or difference of two random variable R and S is the sum of their means.
μ (R-S) = μ(R) - μ(S)
μ(R-S) = 10 - 7 = 3
Property of standard deviation
The variance of Independent variable R and S is is the sum of their variances. Even when we subtract two random variables, we still add their variances; subtracting two variables increases the overall variability in the outcomes.
σ^2(R-S) = σ^2 (R) + σ^2(S)
= 16 + 9 ( variance = (standard deviation)^2 )
= 25
σ(R-S) = 5
The mean of the distribution of R-S is 3 and the standard deviation of the distribution of R-S is 5 and this can be determined by using the given data.
Given :
The distribution of random variable R has a mean of 10 and a standard deviation of 4. The distribution of random variable S has mean 7 and standard deviation 3.The following steps can be used in order to determine the mean and standard deviation of the distribution of R-S:
Step 1 - The mean can be determined by using the below formula.
[tex]\rm \mu(R-S) = \mu(R)-\mu(S)[/tex]
Step 2 - Substitute the values of [tex]\rm \mu(R)[/tex] and [tex]\rm \mu(S)[/tex] in the above expression.
[tex]\rm \mu(R-S) = 10-7[/tex]
[tex]\rm \mu(R-S) = 3[/tex]
Step 3 - The standard deviation can be determined by using the below formula.
[tex]\rm \sigma^2(R-S) = \sigma^2(R)+\sigma^2(S)[/tex]
Step 4 - Substitute the values of [tex]\rm \sigma(R)[/tex] and [tex]\rm \sigma(S)[/tex] in the above expression.
[tex]\rm \sigma^2(R-S) = 16+9[/tex]
[tex]\rm \sigma(R-S) = 5[/tex]
Therefore, the correct option is B).
For more information, refer to the link given below:
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Find the slope of the line
y = 1/4x + 1/3
Thanks!
Answer:
0.0825
Step-by-step explanation:
1/4=0.25
1/3=0.33
69 or 420? ................
Answer:
420 ayeee
Step-by-step explanation:
Answer:
I meeeaaan, both are pretty good numbers ;P
Step-by-step explanation:
Find the simple interest paid to the nearest cent for each principal, interest rate, and time.
$2,620, 3%, 5 years
Pleaseee help!!!
Step-by-step explanation:
You deposit some money into a bank account paying 4% simple interest per year. You received $72 in interest after 3 years. How much the deposit (principal) was?
Use the substitution method to solve the system of equations. Enter your
answer as an ordered pair.
x + y = 11
-X = -y-9
Answer:
Here ya go
Step-by-step explanation:
Examples: 1+2, 1/3+1/4, 2^3 * 2^2
(x+1)(x+2) (Simplify Example), 2x^2+2y a x=5, y=3 (Evaluate Example)
y=x^2+1 (Graph Example), 4x+2=2(x+6) (Solve Example)
List the first 5 Multipluls of 30
Answer:
30*1 = 30 - 1st
30*2 = 60 - 2nd
30*3 = 90 - 3rd
30*4 = 120 - 4th
30*5 = 150 - 5th
Above are the first 5 multiples of 30.
Answer:
30,60,90,120,and 150. I hope this helps:)
Step-by-step explanation:
Solve for r. r + 62 ÷ 2 =1
Hey there!
“r + 62 ÷ 2 = 1”
Combine your like terms
(62 ÷ 2)
62 ÷ 2 = 31
New equation
r + 31 = 1
SUBTRACT by 31
Like: r + 31 - 31 = 1 - 31
Cancel out: 31 - 31 because that gives you 0
Keep: 1 - 31 because that gives you the value of “r”
1 - 31 = -30
Therefore, your answer is: r = -30 ☑️
Good luck on your assignment and enjoy your day!
~LoveYourselfFirst:)
Karl bought 3 1/2 gallons of milk that cost $2.70 per gallon.
What was the total cost of the milk?
Answer:
The total cost would be $9.45
Step-by-step explanation:
Hii, can someone please help? I'm giving BRAINLIEST
Answer:
It would Be C I hoped this helped
Lauren bought a television that cost $805. She plans to make equal payments of $38 each month until the television is paid in full. About how many payments will Lauren make?
Mellssa will rent a car for the weekend. She can choose one of two plans. The first plan has an initial fee of $44 and costs an additional S0.14 per mile driven.
The second plan has an initial fee of $51 and costs an additional $0.09 per mile driven
For what amount of driving do the two plans cost the
Same?
mile
17
What is the cost when the two plans cost the same?
X
5
?
Answer:
Step-by-step explanation:
44+.14x = 51+.09x
.05x=7
140=x, or the amount of driving the two needs to do for the plans to be the same
44+14(.14)
plug it back in to find the cost
$63.60
Solve "43 -
O a = 3/5
O a = 3/4 .
O a = 4/3
O a = 5/3
Answer:
the answer to this question is 4/3
Answer:
C 4/3
Step-by-step explanation:
you're welcome <3
If a function is defined by the formula y = 1/2 x + 3 and its domain is given by the set { -4,0,8}, then which set gives the functions range
Answer:
(-4, 8)
Step-by-step explanation:
Help plz:))) I’ll mark u brainliest
10 ez POINTS
I like animals, what animals do you like?
Answer:
tigers
Step-by-step explanation:
Answer:
cats,bunnys,rabits,snakes,lizards,horses,dogs
Step-by-step explanation:
I need it fasttttttt
5. Rex deposited $900 into an
account that earns 4% simple
interest. How many years will it
take for the value of the
account to reach $1,800?
Answer:
well, there is already $900 so 1800-900=900 now we need 4% of 900 which is $36 900 divided by 36 is 25
it will take 25 years
Step-by-step explanation:
plz mark brainliest i answered first
The number of years that will it take for the value of the account to reach $1,800 should be 25 years.
Calculation of the number of years:Since the deposited amount is $900
The rate of interest is 4%
The future value is $1,800
So here the balance amount should be
= $1,800 - $900
= $900
Now 4% of $900 = 36
So the number of year should be
= [tex]900\div 36[/tex]
= 25 years
hence, The number of years that will it take for the value of the account to reach $1,800 should be 25 years.
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A football team has a total of 800 jerseys. There are 6 medium size jerseys. What is the percentage of medium size jerseys?
Helpppp ! Will give brainlist!
Answer:
5 parks
7 parks
9 parks
10 months
Step-by-step explanation:
1 month: 5 state parks
2 months:5+2=7 state parks
3 months:7+2=9 state parks
x months : 23 state parks
23-9 state parks = 14 state parks
14/2=7 it means 7 months more
3+7=10 months
10 months : 23 state parks
An urn contains 17 white balls and 18 red balls. A sample of four balls is selected at random from the urn. What is the probability that the sample contains two white balls and two red ones?
a. 0.0286
b. 0.2286
c. 0.3974
d. 0.0944
e. 0.0442
f. None of the above.
Answer:
c. 0.3974
Step-by-step explanation:
Given;
number of white balls, W = 17
number of red balls, R = 18
Total number of balls, T = 35
The number of ways the event will occur is given by
= P(2 whites) and P(2 reds)
= P(2whites) x P(2 reds)
= 17C2 x 18C2
= 136 x 153
= 20,808
The total number of possible outcome
= 35C4
= 52,360
The probability = 20,808 / 52,360
= 0.3974
The correct option is "C"
Probability that the sample contains two white balls and two red ones is equal to 0.3974.
So, option c. is correct.
Permutations and combinationsProbability is a discipline of mathematics concerned with numerical explanations of the likelihood of an event occurring or the truth of a claim.
Number of white balls [tex]=\boldsymbol{17}[/tex]
Number of red balls [tex]=\boldsymbol{18}[/tex]
Total number of balls [tex]=\boldsymbol{35}[/tex]
Probability that the sample contains two white balls and two red ones
[tex]=\frac{\binom{17}{2}\binom{18}{2}}{\binom{35}{4}}[/tex]
[tex]=\frac{\frac{17!}{15!2!}\frac{18!}{16!2!}}{\binom{35!}{31!4!}}[/tex]
[tex]=\boldsymbol{0.3974}[/tex]
So, option c. is correct.
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The different kinds of beads that Casey is
using to make purses come in packages of
3 and 9. What is the least number of each
kind of bead that Casey can buy to have an
equal number of each of the different kinds
of beads?
Answer:
Casey can buy 3 packages with 3 beads and one package with 9 beads to have the same number of beads of each kind.
Step-by-step explanation:
Given that:
The beads come in packages of 3 and 9.
To calculate the least number of beads that Casey can have, we will find the least common multiple of both packages.
Package of three = 3, 6, 9, 12, 15
Package of nine = 9, 18, 27, 36
The least common multiple of 3 and 9 is 9.
Hence,
Casey can buy 3 packages with 3 beads and one package with 9 beads to have the same number of beads of each kind.
Let n = 5.
What is the value of the expression 9n2−2−n?
Enter your answer in the box.
Answer:
9 (5) 2 - 2 - 5 = 83
How do you do this question?
Answer:
y(0) = 3
Step-by-step explanation:
This is solved by plugging in each option one by one, and seeing which one results in a positive value for dy/dt.
dy/dt = (4 − 1) (1 − 2²) = -9
dy/dt = (7 − 1) (1 − 1²) = 0
dy/dt = (1 − 1) (1 − 2²) = 0
dy/dt = (-4 − 1) (1 − 0²) = -5
dy/dt = (3 − 1) (1 − 0²) = 2
Only the last option fits.
You are at a restaurant and the check comes to a total of $11. If you want to leave a 17% tip, how much total money should you pay, to the nearest cent?
Answer: $12.87
Step-by-step explanation:
$11 x .17 = $1.87
$11 + $1.87 = $12.87
Let F(x) = 4^x
The new fiction g(x) = f(x-1) +3
Write the new equation for g
Are the ratios 20:16 and 10:8 equivalent?
Identify the type of slope each line has. Place your answer under each graph.
-3, 0, 1/2, undefined
if it is going down its negative if it goes up its positive
first one you can tell because each one to the right it goes 3 down
2nd is 0 because there is no slope to it, last one is undefined because it cant be all the numbers when x is -4
A sector of a circle of radius 80 mi has an area of 1600 mi2. Find the central angle (in radians) of the sector.
Answer:
The central angle of the sector is 0.5 radian
Step-by-step explanation:
given;
radius of the circle, r = 80 mi
area of the sector, A = 1600 mi²
Area of sector is given by;
A = ¹/₂r²θ
where;
θ is the central angle (in radians) of the sector
[tex]\theta = \frac{2A}{r^2}\\\\\theta = \frac{2*1600}{80^2}\\\\ \theta = 0.5 \ radian[/tex]
Therefore, the central angle of the sector is 0.5 radian
The central angle (in radians) of the sector is 28.66 degrees
The formula for calculating the area of a sector is expressed as:
[tex]A = \theta/360 \times \pi r^2[/tex]
Given the following parameters
radius r = 80mi
Area of sector A = 1600mi²
Substitute the given parameters into the formula
1600 = Ф/360 * (3.14)(80)²
1600 * 360 = 20,096Ф
Ф = 576000/20,096
Ф =28.66 degrees
Hence the central angle (in radians) of the sector is 28.66 degrees
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The revenue function is given by R(x)=x⋅p(x) dollars where x is the number of units sold and p(x) is the unit price. If p(x)=34(3)−x6, find the revenue if 6 units are sold. Round to two decimal places.
Find the sum. 637,391 + 372,088 *
Answer:
1,009,479
Step-by-step explanation:
dude there 8a some thing called as a CALCULATOR
Solve for the variable.
5t - 3 = 3t + 9
F
t = 6
G
t = 9
H
t = 3
J
t = 8
Answer:
F. t = 6
Step-by-step explanation
5t - 3 = 3t + 9
add 3t to both sides
2t - 3 = 9
add 3 to both sides
2t = 12
divide both sides by 2
t = 6
help me pleaseeeeee
Answer:
c
Step-by-step explanation: