Answer:
Z = -1.2 ( It is below the group mean), The sudent performed less than average.
Step-by-step explanation:
From the question,
Applying
Z = (x-μ)/σ........................ Equation 1
Where Z = z-score, x = observed score or raw score, μ = mean of the score, σ = standard deviation of the score
Given: x = 55 marks, μ = 70, σ = 12
Substitute these values into equation 1
Z = (55-70)/12
Z = -15/12
Z = -1.25
Hence the z- score is negative, meaning it is below the group mean, I.e the student who get 55 marks, performed less than average
HELP PLEASE DIJDIDJD IM NOT THAT SMART
here's the question
Mr. Aguirre rented an apartment, The security deposit was 40% of one month's rent. If the security deposit was $200, how much money does one month's rent cost?
I have to put the answer in a place value.
Answer: 500
Step-by-step explanation:
200 is 40% of 500
The seventh grade class is putting on a variety show to raise
money. If they charge $15 for each ticket, how many tickets de
they need to sell in order to raise at least $1000?
What is the area of this trapezoid?
Answer:
80
Step-by-step explanation:
A football team had a total of 33 players. One third of the players were seniors. How many players were underclassmen?
Answer:
22
Step-by-step explanation:
1/3 of 33=11
11=number of seniors
2/3 of 33=22
22+11=33
22=number of underclassmen
plz can i get brainliest:)
plz help i really ned help
Answer:yes
57
Step-by-step explanation:
3x+6=21 what is the value of x
Answer:
[tex]3x + 6 = 21 \\ 3x = 21 - 6 \\ 3x = 15 \\ x = \frac{15}{3} \\ x = 5[/tex]
Answer: x=5
Step-by-step explanation:
step 1:
put all the coefficients on one side and all the variables on the other, 3x=21-6
step 2: solve the sides, 3x=15
step 3: divide, 3x/3= 15/3
step 4: simplify: x=5
hello please help thanks
Answer:
evaporation
Step-by-step explanation:
ur welcome
Someone please help me ! Its past due and Ive been busy.. D:
( I didnt mean to click the first answer lol, sorry! <3 )
Answer:
It's okay the first answer is right, $0.15
The store makes $4.20 off the rope
Step-by-step explanation:
11.
Simplify the expression.
(10 - 4² - 4
Plz help
Brent runs around a football field ,14m long and 12m inside. How much metre does Brent need in two laps
Answer:
Distance cover by Brent in 2 Lap = 104 meter
Step-by-step explanation:
Given:
Length of football field = 14 m
Width of football field = 12 m
Find:
Distance cover by Brent in 2 Lap
Computation:
Distance cover by Brent in 2 Lap = 2 x Perimeter of rectangular field
Perimeter of rectangle = 2[l+b]
Perimeter of rectangular field = 2[14 + 12]
Perimeter of rectangular field = 2[26]
Perimeter of rectangular field = 52 m
Distance cover by Brent in 2 Lap = 2 x Perimeter of rectangular field
Distance cover by Brent in 2 Lap = 2 x 52
Distance cover by Brent in 2 Lap = 104 meter
Please answer correctly !!!!!!!!!!!!!! Will mark Brianliest !!!!!!!!!!!!!!!!!!!!
Answer:
1:3
Step-by-step explanation:
1 square is to three triangles
Answer:
4:1
Step-by-step explanation:
Simplify. 14 can go to 4, 4 can go to 1. Therefore: 4:1 ratio.
if i was nine years old an 2002 what age will i be and 2018
Answer:
25
Step-by-step explanation:
2018-2002 is 16 years.
Then add 16 to 9 to get 25!
Chloe has 3 red pencils, 5 blue pencils, and 1 yellow pencil in her backpack . She chooses one pencil at random, puts it back, and then chooses another pencil .
Answer:
then she only has eight pencils in the bag.
Step-by-step explanation:
Answer:
Eight
Step-by-step explanation:
The times to pop a regular bag of microwave popcorn without burning it are Normally distributed with a mean time
of 140 seconds and a standard deviation of 20 seconds. The times to pop a mini bag of microwave popcorn
without burning it are Normally distributed with a mean time of 90 seconds and a standard deviation of 15
seconds. Suppose two independent random samples, 25 of each, are taken and the mean popping times are
calculated. Let R = the popping time of a randomly selected regular-sized bag and M = the popping time of a mini-
sized bag. Which of the following best describes the standard deviation of the sampling distribution of 5-7 ?
1 second
5 seconds
25 seconds
35 seconds
Answer:
3
Step-by-step explanation:
Approximately normal with mean of 140 seconds and standard deviation of 10 seconds.
What is Central Limit Theorem:?The Central Limit Theorem establishes that, for a normally distributed random variable X, with mean and standard deviation , the sampling distribution of the sample means with size n can be approximated to a normal distribution with mean.
here, we have,
Given,
In the question:
The times to pop a regular bag of microwave popcorn without burning it are Normally distributed with a mean time of 140 seconds and a standard deviation of 20 seconds. The times to pop a mini bag of microwave popcorn without burning it are Normally distributed with a mean time of 90 seconds and a standard deviation of 15 seconds.
For a skewed variable, the Central Limit Theorem can also be applied, as long as n is at least 30.
Mean of 140, standard deviation of 20, sample of 4:
By the Central Limit Theorem, the distribution is approximately normal.
Mean is the same, of 140.
n = 4 , σ = 20, thus:
s = σ /√n
= 20/√4
= 10
Thus, the correct answer is:
Approximately normal with mean of 140 seconds and standard deviation of 10 seconds.
Learn more about Central limit theorem at:
brainly.com/question/18403552
#SPJ5
For the GJW Clean Up event, Ms. Baran spent $37.95 on 23 packets of hand wipes for
her team of volunteers. What was the price of each packet think unit rate/price)?
Pls I need help on this quick
Plzzzzzzzzzzz my marking period ends in 3 days, I’m crying plzzz help
No links please and thank you
Answer:
Step-by-step explanation:
(find the percent by multiplying the percentage, .45, by the total number of shoes = 18 shoes)
% = 45%
p = 18
w = 40
(i did 100/40 which equals to 2.5 then multiplied 2.5 by the numerator so the numerator and denominator would both be equivelant.)
18/40 = 45/100
(multiply the whole (40) by the decimal value (.45) which is equal to 18)
40 x .45 = 18
(answer)
If Ms. M has 40 pairs of shoes, 18 of those shoes are sneakers.
Solve proportion
5/2=6/x ???
Answer:
[tex]x = \frac{12}{5} = 2.4[/tex]
Answer:
5/2=6/×
Step-by-step explanation:
the answer is 12/5 or in decimal 2.4
solve for a
2a+3b=12-2(2b+a)
PLEASE SHOW WORK ILL MARK BRAINLIEST.
Answer:
a = 3 - (7/4)b
Step-by-step explanation:
Start by performing the indicated multiplication:
2a+3b=12-2(2b+a) => 2a+3b=12 - 4b - 2a
Next, combine like terms: 4a + 7b = 12
Isolate 4a by subtracting 7b from both sides:
4a = 12 - 7b
Finally, divide both sides by 4:
a = 3 - (7/4)b
-12.5 would be between the numbers ___ and ___ because...
Answer:
- 12.5 would be between the numbers - 12 and - 13.
answer this question!!! :)
Answer:
X = 1
Step-by-step explanation:
You first divide each side by 3 leaving you with X+5 = 6. Then you take the 5 to the other side leaving you with X=6-5 as the 5 changes from positive to negative. So 6-5=1 so X=1
Hope this helped
-A3miz
Age:13
These four numbers are plotted on a number line: -2/3, 5/8, -3/5, and -1/2. Which is the correct ordering on the number line from left to right?
A. -1/2, -3/5, 5/8, -2/3
B. -3/5, -2/3, -1/2, 5/8
C. -2/3, -3/5, -1/2, 5/8
D. -1/2, -3/5, -2/3, 5/8
Answer:
-2/3 ; - 3/5 ; - 1/2 ; 5/8
Step-by-step explanation:
Given that:
We could convert the numbers to decimal to obtain a better view of the values :
-2/3 = - 0.66666
5/8 = 0.625
-3/5 = - 0.6
-1 /2 = - 0.5
Negative values are always arranged first on left of a number line.
-0.66666 < - 0.6 < - 0.5 <0.625
Hence,
-2/3 ; - 3/5 ; - 1/2 ; 5/8
6. Sara Just spent $44 to get her hair styled. She
wants to leave a 15% tip for her hairdresser. How
much should she leave for the tip?
Answer:
$6.60
Step-by-step explanation:
You'd take the total anf multiply it by your percent amount with the decimal moved two places to the left
44 * .15 = 6.60
Is 0.2 equivalent to 2/100
Answer:
no
Step-by-step explanation:
What is the area of this square with sides of 5x⁴y²?
Answer:
Area of given Square = 25x⁸y⁴
Step-by-step explanation:
Given:
Side of a square = 5x⁴y²
Find:
Area of given Square
Computation:
Area of Square = Side²
Area of Square = Side × Side
Area of given Square = [5x⁴y²]²
Area of given Square = [5x⁴y²] × [5x⁴y²]
Area of given Square = [5 × 5][x⁴ × x⁴][y² × y²]
Area of given Square = [25][x⁴⁺⁴][y²⁺²]
Area of given Square = [25][x⁸][y⁴]
Area of given Square = 25x⁸y⁴
Create a system of equations to represent the word problem. Then solve using the linear combination/elimination method. Show all your work. Adam's Printing Inc. has two types of printing presses: Model A and Model B. Model A can print 80 books per day and Model B can print 55 books per day. Altogether Adam has 9 printing presses. If he can print 670 books in a day, then how many of each press does he have?
Answer:
Solution given:
model A printers [a] prints=80books per day
model B printers [b] prints=55books per day
total no of printers =9
no of model A printers be x
and
no of model B printers be [9-x]
According to the question;
ax+(9-x)b=670 books
substituting value of a and b; we get
80x+(9-x)55=670
80x-55x+495=670
25x=670-495=175
x=[tex] \frac{175}{25} [/tex]=7
So;
no of model A printers =x=7
no of model B printers =9-x=9-7=2
is your answer.
Which of the following is equivalent to the expression shown below
Answer:
v^3/2
Step-by-step explanation:
(sqrt(v))^3
sqrt(v)^3
v^3/2
¿ Could you give me the answer?
Answer:
6.28cm²
Step-by-step explanation:
the radius is 1 so
2x1 x pi
2 x 3.14
6.28
What is the factored form of 25x²-64?
Answer:
25x²-64(5x)²-8²(5x-8)(5x+8)hope it helps.
how many solutions does 2(4x+5)=8x+8
Answer:
Step-by-step explanation:
Its no soluction.
Triangle ABC has vertices A(1,4), B(-1,5), and C(1,-4). Triangle ABC is dilated and
B' is located at (-3,15). What is the y-coordinate of C'?
Answer:
-12
Step-by-step explanation:
The coordinates of B' are just 3 times the coordinates of B, so the multiplier in the dilation is 3.
C' is the point with coordinates 3 times the coordinates of C, making C'(3, -12).
The y-coordinate is -12.