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
jeka94
3 years ago
15

In class A, John got 85 for his first test John's class mean was 75 and standard deviation was 5. In class B, Kathy got 80 in he

r first test. Kathy's class mean was 50and standard deviatoin was 10. In a fair comparison of the two studens in two different classes who did better in his or her test. a. John b. Kathyc. same d. none of the above
Mathematics
1 answer:
ivanzaharov [21]3 years ago
6 0

Answer:

b. Kathy

Step-by-step explanation:

We compare each of their score by how far away from the mean when in term of the standard deviation. Using the following formula

\frac{x - \mu}{\sigma}

For John he is (85 - 75)/5 = 2.

For Kathy she is (80 - 50)/10 = 3.

Since Kathy is 3 standard deviation better than her class' average, while John is only 2's. We conclude that Kathy did better.

You might be interested in
35 x 30 = 35 x ____tens, <br> ____=____tens, <br> ___=____.
JulsSmile [24]

3 tens , 105 tens , 1050

6 0
3 years ago
Keisha is riding her bike to her friend Trina’s house to study for her Math test. • Trina lives 7 miles north of Keisha’s house.
Anestetic [448]

Answer:it’s f

Step-by-step explanation:

3 0
2 years ago
Read 2 more answers
Make vthe subjject of the formulaE=mvsquare/ 2<br>find the value of v when m =2 and E=64​
Maksim231197 [3]

E=mv²

divide both sides by m

E/m=v²

square root both sides

v=√E/m

m=2,E=64

v=√64/2

v=9/√2

6 0
3 years ago
Math questions please help
romanna [79]
18. 18x1024
19. a or c
5 0
3 years ago
Need help finding answer
wolverine [178]

Answer:

BD is 3.75 units

Step-by-step explanation:

Given:

BA = 6 units

CA = 8 units

DC = 5 units

To Find:

BD = ?

Solution:

Triangle Angle Bisector Theorem.

An angle bisector of an angle of a triangle divides the opposite side in two segments that are proportional to the other two sides of the triangle.

I.e Here in Δ BAC,

AD is the Bisector of ∠ A

∴ \frac{BA}{CA}= \frac{BD}{DC}

Substituting th above given values in it we get

∴ \frac{6}{8}= \frac{BD}{5}

∴ BD = 5\times \frac{6}{8} \\\\BD = \frac{30}{8} \\\\BD = 3.75\ units\\

Therefore BD is 3.75 units

5 0
3 years ago
Other questions:
  • rachel was cutting out some fabric for a friend. she cut a piece that was 5 cm wide and had an area of 20(20)cm. how long was th
    11·1 answer
  • What is 5,918 divided by 65
    6·1 answer
  • What is the answer to this 2x - 5 = -9
    11·1 answer
  • Write the sentence as an equality
    8·1 answer
  • What is the fair share?
    13·2 answers
  • Simplyfy the given equation 5x+2(x-3)=-2(x-1)
    15·1 answer
  • T/4 &gt; 7 solve the inequality
    11·1 answer
  • What's the answer for 18.9 hundred ninety four rounded to the nearest hundreds
    8·2 answers
  • Which of the following lines is perpendicular to a line with a slope of 5?
    13·1 answer
  • The surf instructor has an initial fee of $12 and charges $8 per hour for lessons, which is represented by the equation y = 8x +
    10·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!