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
Darya [45]
3 years ago
9

Suppose the mean SAT verbal score is 525 with a standard deviation of 100, while the mean SAT math score is 575 with a standard

deviation of 100. What can be said about the mean and standard deviation of the combined math and verbal scores
Mathematics
1 answer:
Ipatiy [6.2K]3 years ago
6 0

Answer:

The mean of the combined math and verbal scores is 1100, while the standard deviation is 141.

Step-by-step explanation:

Normal variables

Normal variables have mean \mu and standard deviation \sigma

When we add normal variables, the combined mean is the sum of both means, and the standard deviation is the square root of the sum of both variances. The distribution is still normal.

In this question:

Verbal: \mu_{V} = 525, \sigma_{V} = 100.

Math: \mu_{M} = 575, \sigma_{M} = 100

Combined:

\mu = \mu_{V} + \mu_{M} = 525 + 575 = 1100

\sigma = \sqrt{\sigma_{V}^{2}+\sigma_{M}^{2}} = \sqrt{100^2 + 100^2} = 141

The mean of the combined math and verbal scores is 1100, while the standard deviation is 141.

You might be interested in
1/4 divided by 2 = ??
Iteru [2.4K]

Answer:

1/8

Step-by-step explanation:

Hi there!

To divided fractions, you must flip the second fraction and multiply instead.

For example,

1/4 divided by 2 is the same thing as 1/4 x 1/2.

You then multiple straight across to get 1/8.

Really hope this helps!

8 0
3 years ago
Read 2 more answers
A Country’s population in 1990 was 134 million. In 2000 it was 139 million. Estimate the population in 2014 using the exponentia
Ivahew [28]

Answer:

167 million

Step-by-step explanation:

The ratio is 1 million people every 2 years

7 0
3 years ago
WILL GIVE BRAINLIEST AWARD! THANKS AND STARS, <br><br> What is the length of the segment EH?
MakcuM [25]

Answer:

The answer is 25.

Step-by-step explanation:

6 0
3 years ago
What is the product of 18 and k
SashulF [63]
18k i believe because it is a varible and a number so when u multiply them u just put them together.... is this multi choice question because to see the answers would help
8 0
3 years ago
10z + 3 =9z solve for z
Eva8 [605]

z=-3

Step-by-step explanation:

3 0
3 years ago
Read 2 more answers
Other questions:
  • What is the slope of the line through (-2,-6)(−2,−6)left parenthesis, minus, 2, comma, minus, 6, right parenthesis and (2,2)(2,2
    7·1 answer
  • Find the output, k, when the input, t, is 3.<br><br> K=13t-2<br> K=
    12·1 answer
  • Which of the following does not represent a function?
    11·1 answer
  • Find the complement of the angle shown. Find the supplement of the angle shown
    5·2 answers
  • A number cube is rolled and a spinner is spun. Find the probability. The spinner has five sections. 3 sections have the letter B
    11·1 answer
  • Once a week you babysit your neighbor’s toddler after school, usually going to a local playground. You notice that each swing on
    8·2 answers
  • What is the slope of the line graphed below (3,6) (0,-1)
    11·2 answers
  • Solve for R: P = R/V
    8·1 answer
  • What is the exterior angle of 30°
    14·2 answers
  • Colton opened a savings account and deposited $1,000.00 as principal. The account earns 11% interest, compounded annually. What
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!