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
emmainna [20.7K]
1 year ago
6

On a standardized exam, the scores are normally distributed with a mean of 165 and astandard deviation of 40. Find the z-score o

f a person who scored 145 on the exam.
Mathematics
1 answer:
vladimir1956 [14]1 year ago
8 0

The Z-score is calculated by the formula below

\begin{gathered} z-score=\frac{(x-\mu)}{\sigma}_{} \\ \mu=\operatorname{mean} \\ \sigma=s\tan dard\text{ deviation} \\ x=\text{score} \end{gathered}

Step 2: Substitute the given parameters in the formula

\begin{gathered} z-\text{score}=\frac{145-165}{40} \\ Z=-\frac{20}{40} \\ Z=-\frac{1}{2} \\ Z=-0.5 \end{gathered}

Hence, the z-score of a person who scored 145 on the exam is -0.5

You might be interested in
PLZ HLP! You ask 125 randomly chosen students to name their favorite food. There are 1500 students in the school. Predict the nu
arsen [322]

Answer:

696

Step-by-step explanation:

58/125 = 46.4%

0.464 x 1500 = 696 people

6 0
3 years ago
14. Molly puts two shapes together to make a new shape. The new shape has 6 sides and 6 vertices. Which two shapes did she use?
olganol [36]

She used two trapezoids.

She put one trapezoid on top and one on the bottom.

The shape she ends up making is a hexagon.

3 0
3 years ago
Please help now with homework
damaskus [11]
The correct answer is 1.25 dollars per pound. You can check it by multiplying it with 4.16
5 0
3 years ago
Write an equation of the parabola with the vertex (-5,4) and focus (-5,0)
ch4aika [34]

Answer:

-0.4 or -10.4

Step-by-step explanation:

5 0
3 years ago
(Will award Brainlies & many many points, please help!)
iren [92.7K]

Answer:

B] f(n) = 6(3)n − 1; f(5) = 486

Step-by-step explanation:

First, you have to identify which type of relation the points have. From the graph you can tell that it's an exponential growth. The x values change in the same amount every time, in this case by 1.

So if the relation is exponential, if we divide the y coordinates you should get the same result every time.

18 / 6 = 3

54 / 18 = 3

162 / 54 = 3

So the y value increases 3 times. That means that the next value should be 162*3 = 486.

3 0
3 years ago
Read 2 more answers
Other questions:
  • Line segments XY and ZY are tangent to circle O.
    8·2 answers
  • If ƒ = {(2, -4), (2, 7) (3, 5), (4, -1), (8, 7)}, then ƒ is a function.
    12·1 answer
  • Find six rational numbers between 3 and 4.
    11·2 answers
  • After swimming 80 feet below the surface of the water, a whale swims up 40 feet. Use a number line to help you create an equatio
    12·1 answer
  • Which is the graph of f(x)=x^2-2x+3
    10·1 answer
  • UNIT 3 LAB QUESTIONS
    8·1 answer
  • WORTH A BRAINLIEST
    10·1 answer
  • Do the side lengths 9,12,15 classify as a right,acute,obtuse triangle, or “no possible triangle”
    12·1 answer
  • A and B take M days to complete a task together if A takes 27 days more than A and B to complete the task alone. And if B takes
    9·1 answer
  • Solve the equation for x:<br> 4x2 + 15x = 4<br> Show steps please
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!