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
andrezito [222]
3 years ago
15

Scores on a national math test are Normally distributed, with a mean score of 490 and a standard deviation of 50. Which test sco

re represents the top 20%, rounded to the nearest whole number?
Find the z-table here.

426
448
532
554
Mathematics
2 answers:
alisha [4.7K]3 years ago
7 0

Answer:

532

Step-by-step explanation:

The score that represents the top 20% = A score = 80%

Z score for 80% percentile = 0.842

We solve using the z score formula

z = (x-μ)/σ, where

x is the raw score = ??

μ is the population mean = 490

and σ is the population standard deviation = 50

Hence:

0.842 = x - 490/50

Cross Multiply

0.842 × 50 = x - 490

x = 0.842 × 50 + 490

x = 42.1 + 490

x = 532.1

Approximately = 532

Therefore, the test score = 532

11Alexandr11 [23.1K]3 years ago
7 0

Answer:

532

Step-by-step explanation:

edg 2020-2021

You might be interested in
A ramp slopes from a warehouse door down to the street. The height of the ramp is 5 feet, and the ramp ends 10 feet from the bas
Tomtit [17]
If you graph this, your first point will be at (0,5), as the ramp is at the warehouse door but 5 feet up. The second point is (10,0) as it is touching the ground but it's 10 feet away from the warehouse.
To find slope, you do (y2-y1)/(x2-x1).
When substituting in the variables, you get (0-5)/(10-0), which is -5/10, which is simplified to -1/2. Of course, that is when the warehouse is Quadrant II. If you look at it from another point of view, the slope will be positive so your answer is A) 1/2.
If this was unclear feel free to comment :)
3 0
3 years ago
Read 2 more answers
Convert 6500 ounces to liters.
tekilochka [14]

your answer is 192.23

8 0
3 years ago
How many numbers between <br>2<br> and <br>500<br> are divisible by <br>3<br>?​
beks73 [17]

Answer:

Your answer is 226 numbers.

6 0
3 years ago
Read 2 more answers
Giải hộ toi bài tập nó khá khó
deff fn [24]

Answer:

hhhhhhhhhhhhhhhhhhhh

5 0
2 years ago
Need help with this one
steposvetlana [31]

Answer:

∠TRS = 40°

Step-by-step explanation:

∠UTS is an exterior angle of the triangle

The exterior angle of a triangle is equal to the sum of the 2 opposite interior angles, that is

∠UTS = ∠TRS + ∠RST

9x - 15 = 3x + 16 + x + 9

9x - 15 = 4x + 25 ( subtract 4x from both sides )

5x - 15 = 25 ( add 15 to both sides )

5x = 40 ( divide both sides by 5 )

x = 8

∠TRS = 3x + 16 = (3 × 8) + 16 = 24 + 16 = 40°

4 0
3 years ago
Other questions:
  • Samuel is in charge of ordering lunch for participants in a company seminar. He needs to order 24 lunch specials that each cost
    14·1 answer
  • Linear Equations<br><br> 4(t-2) + 2t -4 = 2(9-2t)
    7·1 answer
  • What is y= -4 7x -7y =-21
    10·1 answer
  • What is the answer to 14×67
    10·1 answer
  • Factor (2x^2+ay)(-ax^2-2y)
    11·1 answer
  • Sin10° + tan40° × cos10° = ?<br>how to solve this??
    9·1 answer
  • Lori works as a cartoonist for a teen magazine.The time she spent sketching is given by the equation m=12s, where mis the number
    6·1 answer
  • Given f(x) = x^2 - 10x + 4, find f(-2)
    10·1 answer
  • What is the distance between points M(2,6) and N(3,1)
    8·1 answer
  • The calling convention should be such that every function is caller-independent. What does that mean
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!