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
Varvara68 [4.7K]
4 years ago
11

The scores of eight grade students in a math test are normally distributed with a mean of 57.5 and a standard deviation of 6.5.

From this data, we can conclude that 68% of the students recieved scores between
a)34 and 64
b)34 and 68
c)51 and 64
d)51 and 68
Mathematics
1 answer:
rewona [7]4 years ago
8 0
Work out the z scores  for   51  and 54 
z1 = (51 - 57.5) / 6.5 = -1
z2 = (64  - 57.5)/6.5 = 1
from tables of normal distribution this value os 3413 + 3413  = 68.26%


so the answer is  c
You might be interested in
There are 1200 fish in the sea, 1 of every 3 are spotted. How many are not spotted?
Kazeer [188]
A third are spotted so that would mean 2/3 are not spotted so if you take 1200 divide it by 3 and then multiply it by 2 you get 800 which is your answer
5 0
3 years ago
Use the method of completing the square to transform the quadratic equation into the equation form (x + p)2 = q. 3 + x - 3x2 = 9
Triss [41]
To <span>transform the quadratic equation into the equation form (x + p)2 = q we shall proceed as follows:
3+x-3x^2=9
putting like terms together we have:
-3x^2+x=6
dividing through by -3 we get:
x^2-x/3=-2
but
c=(b/2a)^2
c=(-1/6)^2=1/36
thus the expression will be:
x^2-x/3+1/36=-2+1/36
1/36(6x-1)</span>²=-71/36

the answer is:
1/36(6x-1)²=-71/36
7 0
3 years ago
9y^2-6y+1=0<br> FIND Y PLEASE HELP STEP BY STEP
dlinn [17]

Answer:

y = 1/3

Step-by-step explanation:

<u>Step 1:  Factor</u>

9y^2 - 6y + 1 = 0

(3y - 1)(3y - 1) = 0

(3y - 1)^2 = 0

<u>Step 2:  Solve for y</u>

3y - 1 + 1 = 0 + 1

3y / 3 = 1 / 3

y = 1/3

Answer: y = 1/3

4 0
3 years ago
Given the right triangle below, if AB = 4 and BC = 4, find AC.
Usimov [2.4K]

Answer:

squre root 32

Step-by-step explanation:

6 0
3 years ago
Dominic is 72 inches tall and casts a 6o inch shadow his son who is standing next to him cast a 50 inch shadow how tall is his s
Lostsunrise [7]

Dominics son is 45inches tall

<u>Step-by-step explanation:</u>

Let his sons height be 'h'

If Dominic is 72 inches and casts a shadow of 60 inches. His son casts a shadow of 50 inches.

Then We can say that,

h = 50 x (72/60)

h = 45 inches

Dominics son is 45inches tall

3 0
3 years ago
Other questions:
  • Abdul is choosing a 3 letter password from the letters A,B,C,D, and E. The password cannot have the same letter repeated in it.
    6·2 answers
  • The temperature was -9°F in the morning and rose to a temperature of 17°F in the afternoon. What was the change in temperature f
    5·1 answer
  • Determine the type and number of solutions of 4x^2-5x+1=0.
    12·1 answer
  • 12 1/2 as a decimal .......................................................
    10·2 answers
  • Segment AB is congruent to segment AB. This statement shows the ______ property. reflexive symmetric transitive substitution
    7·2 answers
  • A parallelogram has coordinates A(1, 1), B(5, 4), C(7, 1), and D(3, -2). What are the coordinates of parallelogram A′B′C′D′ afte
    5·1 answer
  • Two sides of a trapezoidal are 25 meters. The third side is 40 meters. The fourth side is 20 meters shorter than the longest sid
    14·1 answer
  • HELP ME PLSSSSSSS!!!!!!!!!
    6·1 answer
  • Answer asap!!!!!!!!!!!!!!!!
    9·1 answer
  • Find the value of x.
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!