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
TiliK225 [7]
3 years ago
15

Find the standard deviation of the following R.V. Show all work...no calculator shortcuts...but then check with 1-var stats.

Advanced Placement (AP)
1 answer:
maxonik [38]3 years ago
8 0

Answer:

7.6997

Explanation:

Given :

X : ____7 ____ 15 ____ 28

P(X) __0.2 ___0.49 ____?

ΣP(x) = 1

0.2 + 0.49 + a = 1

a = 1 - 0.69

a = 0.31

Standard deviation = sqrt(Variance(x))

Variance = Var(X) = Σx²p(x) - E(x)²

E(x) = Σx*p(x) = (7*0.2) + (15*0.49) + (28*0.31) =

E(x) = 17.43

Σx²p(x) = (7^2 * 0.2) + (15^2 * 0.49) + (28^2 * 0.31) = 363.09

Var(X) = Σx²p(x) - E(x)²

Var(X) = 363.09 - 17.43^2

Var(X) = 363.09 - 303.8049

Var(X) = 59.2851

Standard deviation = sqrt(59.2851)

Standard deviation = 7.6996818

= 7.6997

You might be interested in
snickers or Twix? Choose wisely
9966 [12]
Twix all the way!! Snickers are trash
6 0
3 years ago
Read 2 more answers
Pls help
KATRIN_1 [288]

Answer:

D. Witnessed the development of new technology

6 0
3 years ago
Read 2 more answers
Primary succession __________.
Monica [59]
Primary succession is one of two types of biological and ecological succession of plant life, occurring in an environment in which new substrate devoid of vegetation and other organisms usually lacking soil, such as a lava flow or area left from retreated glacier, is deposited.
7 0
3 years ago
Question 3 (tiple Choice Worth 5 points)
garri49 [273]

Answer:

colonization

Explanation:

Language diffusion can be defined as the move of language from its origin to other places.

The British colonized Australia in 1788 after claiming the land as British territory in 1770. A new government was formed to oversee the affairs of the country and as a result of this colonisation, the Australians had to learn English language because that was what their colonial masters spoke and used to communicate.

Therefore, the correct answer is B

5 0
3 years ago
Which of the following methods of agriculture is best suited to the use of large plowing and harvesting equipment?
DochEvi [55]

The correct answer would be option B, American agriculture.

American Agriculture is best suited to the use of large plowing and harvesting equipment.

Explanation:

In the United States, Agriculture is one of the main industries of the country. This is a net exporter of the food items.

According to the census of agriculture in the previous decade, there were 2.2 Million farms in the United States. These farms covered 922 million acres of area. This means that on average, each farm was equal to 418 acres.

So when the farming industry is so much prevailing in America, and the space is almost unlimited, then the best method for them is to use large plowing and harvesting equipment, to save time and to get the maximum output.

Learn more about American Agriculture at:

brainly.com/question/1885948

#LearnWithBrainly

8 0
3 years ago
Other questions:
  • Which of the following materials would be used to reinforce concrete? A.livestock woven wireB.welded wire fabric C.smooth galvan
    15·1 answer
  • One of the students in your class often asks questions of your professor. You see that the professor rolls her eyes each time th
    5·1 answer
  • What technique allows the results of the survey to be generalized to larger population
    11·2 answers
  • A group of students is setting up a test to see whether earthworms prefer rough or smooth surface is what type of investigation
    10·1 answer
  • A control loop has components
    11·1 answer
  • Crude birth rate 38/1,000 individuals
    14·1 answer
  • What's the best strategy to avoid paying interest on credit cards?
    15·1 answer
  • When creating a database, after you have created fields, selected a key field, and named your database,
    9·1 answer
  • How many years would it take to reach the sun without using modern tech
    9·1 answer
  • At the beginning of the third paragraph (“Small . . . gate”), the narrator’s repetition of the adjective “little” suggests that
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!