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
matrenka [14]
3 years ago
9

Scores on an exam are normally distributed with a mean of 67.5 and a standard deviation of 10. Find the percent of the scores th

at satisfy each question.
a)Less than 32


b)At least 70


c)Between 56 and 66
Mathematics
1 answer:
lozanna [386]3 years ago
6 0

Answer:

C

Step-by-step explanation:

You might be interested in
What is the image of the point (-1,-3) after a rotation of 90 ∘ counterclockwise about the origin?
AVprozaik [17]

Answer:

(-3,1)

Step-by-step explanation:

8 0
3 years ago
Pleasee help x.x 1. Solve the system by elimination-
patriot [66]
Q1. The answer is x = 1, y = 1, z = 0

<span>(i) -2x+2y+3z=0
</span><span>(ii) -2x-y+z=-3 
</span>(iii) <span>2x+3y+3z=5
</span><span>_________
Sum up the first and the third equation:
</span>(i) -2x+2y+3z=0
(iii) 2x+3y+3z=5
_________
5y + 6z = 5

Sum up the second and the third equation:
(ii) -2x-y+z=-3 
(iii) 2x+3y+3z=5
_________
2y + 4z = 2


(iv) 5y + 6z = 5
(v) 2y + 4z = 2
________
Divide the fifth equation by 2
(iv) 5y + 6z = 5
(v) y + 2z = 1
________
Multiple the second equation by -3 and sum the equation
(iv) 5y + 6z = 5
(v) -3y - 6z = -3
________
2y = 2
y = 2/2 = 1


y + 2z = 1
1 + 2z = 1
2z = 1 - 1
2z = 0
z = 0


-2x-y+z=-3
-2x - 1 + 0 = -3
-2x = -3 + 1
-2x = -2
x = -2/-2 = 1



Q2. The answer is x = -37, y = -84, z = -35

<span>(i) x-y-z=-8 
(ii) -4x+4y+5z=7 
(iii) 2x+2z=4
______
</span>Divide the third equation by 2 and rewrite z in the term of x:
(iii) x+z=2
z = 2 - x
______
Substitute z from the third equation and express y in the term of x:
<span>x-y-(2-x)=-8 
x - y - 2 + x = 8
2x - y = 10
y = 2x - 10
______
Substitute z from the third equation and y from the first equation into the second equation:
</span><span>-4x + 4y + 5z = 7 
-4x + 4(2x - 10) + 5(2 - x) = 7
-4x + 8x - 40 + 10 - 5x = 7
-x -30 = 7
-x = 30 + 7
x = -37
y = 2x - 10 = 2*(-37) - 10 = -74 - 10 = -84
z = 2 - x = 2 - 37 = -35</span>
8 0
3 years ago
A triangular pane of glass has a height of 34 inches and an area of 442 square inches. What is the length of the base of the pan
Katena32 [7]

Answer:

26

Step-by-step explanation:

3 0
3 years ago
Read 2 more answers
Can someone help me on this math question pls I have 12 more questions I need help on too !
love history [14]

A is the answer. Since they will both be divided by 4 due to the same amount of points, because Globrite has a greater range, it will have a greater mean. Glo brite also ranges bigger than Luminate

5 0
3 years ago
Persons who work as sales managers, therapists, and teachers may be high in ____ intelligence.
Basile [38]
These are all service professions and ones in which the individual does well if they are in tune with how their clients, patients and students are feeling/understanding. Therefore, it is likely that people who excel in these fields are high in "emotional intelligence."
7 0
3 years ago
Other questions:
  • What would a 20% increase of 25.9 be? I think it'd be 77.22 but not quiet sure
    15·2 answers
  • Tyler is thinking of a number that is divisible by 2 and by 3. Write another number in which Tyler's number must also be divisib
    13·1 answer
  • In 2018 the population of California was 39,810,000 people. The population also grew by 0.8% that year. Which equation models th
    5·1 answer
  • Sing the correct answer from part b, calculate the volume of a rectangular prism with a length of 5.6 cm, a width of 2.1 cm, and
    8·1 answer
  • Help!!! MATHS QUESTION I WILL GIVE YOU A HEART!!!
    8·1 answer
  • Gasoline at a particular gas station costs $2.78 per gallon. If Cory buys $18 of gas, how many gallons did he buy?
    15·1 answer
  • Can U pls help with this number in the sequence​
    5·1 answer
  • A total of 19,035 people skied at the resort during the 5 days
    13·2 answers
  • Krysta has $100 in a savings account that earns 5% annually. The interest is not
    7·1 answer
  • Hcf of 84 and 49 I'm so lazy
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!