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
Helga [31]
3 years ago
5

The average score of 100 students taking a statistics final was 70 with a standard deviation of 7. Assuming a normal distributio

n, what test score separates the top 25% of the students from the lower 75% of students?
Mathematics
1 answer:
san4es73 [151]3 years ago
8 0

Answer:

74.72

Step-by-step explanation:

Given

mean\left ( \mu \right )=70

Standard deviation \left ( \sigma \right )=7

For Top 25%

P\left ( Z

and Z value for 75 % is 0.6744

Thus score which separates the Top 25% of students is

=\mu +\sigma \cdot Z

=70+7\cdot 0.6744=74.7208

You might be interested in
Which expression represents the volume, in cubic units, of the composite figure? One-third(8)(6)(6) (8)(6)(4) One-third(8)(6)(10
vaieri [72.5K]

The expression of Volume in cubic meter  \frac{1}{3} (8)(6)(6)+(8)(6)(4)

The correct option is (1)

<h3>What is Volume?</h3>

Volume can also be defined as the amount of space occupied by a 3-dimensional object. The volume of a solid like a cube or a cuboid is measured by counting the number of unit cubes it contains.

Volume will be,

V= Volume of rectangular pyramid + Volume of cuboid

 

Volume of rectangular pyramid= \frac{1}{3} * base area* height

                                                   = \frac{1}{3} * 6*8*(10-4)

                                                   =\frac{1}{3} * 6*8*6

Volume of cuboid= l*b*h

                              = 4*6*8

So, Volume   =\frac{1}{3} * 6*8*6 + 4*6*8

                     = \frac{1}{3} (8)(6)(6)+(8)(6)(4)

So, The expression of Volume in cubic meter  \frac{1}{3} (8)(6)(6)+(8)(6)(4).

Learn more about Volume here:

brainly.com/question/15626455

#SPJ1

 

3 0
2 years ago
Find the value of z. round to the nearest hundredth
Svetradugi [14.3K]

ANSWER

C. 64.29

EXPLANATION

The bigger right triangle is similar to the smaller right triangle, therefore

\frac{30}{14}  =  \frac{z}{30}

Multiply both sides by 30;

30 \times  \frac{30}{14}  =  \frac{z}{30}  \times 30

Simplify

z =  \frac{900}{14}

z = 64.28571429

We correct to the nearest hundredthth to obtain,

z = 64.29

The correct choice is C.

3 0
3 years ago
Jada has 7/8 cup of cheese. Her cheese bread recipe calls for 1/6 cup of cheese . How many times can she make her recipe with th
masha68 [24]
You need to have the common denominator and once you do see how many times the 1/6cup will go into the 7/8cup which is 5
4 0
3 years ago
Read 2 more answers
What is the formula for the circumference of a circle using the radius?
marta [7]
We know that:
C=πd Were π(pi)=3,14... and d=diameter
We know that the radious is 2d, so we aply this to the formula and we get that:
C=2πr
4 0
3 years ago
WILL MARK BRAINLYEST<br> ❤️❤️❤️❤️❤️❤️
Valentin [98]

Answer:

$108.19

Step-by-step explanation:

First, converting R percent to r a decimal

r = R/100 = 3.6%/100 = 0.036 per year.

Solving our equation:

P = 119.88 / ( 1 + (0.036 × 3)) = 108.19494584838

P = $108.19

The principal investment required to get a total amount, principal plus interest, of $119.88 from simple interest at a rate of 3.6% per year for 3 years is $108.19.

Hope this helps!

6 0
3 years ago
Other questions:
  • Barry and 3 friends share 2 oranges equally. What fraction of an orange will each person get?
    15·2 answers
  • The final exam scores in a statistics class were as follows: 90, 70, 63, 98, 95, 32, 54, 89, 84, 80, 68, 71, 77, 71, 83 find the
    5·1 answer
  • I need y’all please help number 6
    7·1 answer
  • The second photo is the answer choices. Please answer
    5·1 answer
  • A garden supply store sells two types of lawn mowers. Total ales of mowers for the year were $8379.70. The total number of mower
    14·1 answer
  • Please help with this question
    8·2 answers
  • The height of one right cylinder is 5 centimeters and its radius is 2 centimeters. The height of the second right cylinder is 20
    14·2 answers
  • Which number sentence is true <br> 4.05=0.45<br> 4.05&lt;0.45<br> 0.45&gt;0.5<br> 0.45&lt;0.5
    13·1 answer
  • HELPPP PLSSS 18. A triangle has verticesA(4,3), B(6,9) and C(2, -3). The triangle is rotated 90°
    6·1 answer
  • Use the properties of the definite integral to find
    11·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!