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
Vika [28.1K]
3 years ago
13

(i) Calculate the mean and standard deviation for these weekly incomes.

Mathematics
1 answer:
polet [3.4K]3 years ago
7 0

Answer:

Mean = 272.3

sd = 37.7

Step-by-step explanation:

Mean = sum/n

(221+248+251+255+259+263+264+272+291+297+374) ÷ 11

= 2995/11

= 272.2727273

Variance = (sum of x²)/n - mean²

[(221²+248²+251²+255²+259²+263²+264²+272²+291²+297²+374²)/11] - (2740/11)²

= (831067/11) - (2995/11)²

= 1419.107438

sd² = variance

sd = sqrt(1419.107438)

sd = 37.67104243

You might be interested in
An ornithologist has 4 bird feeders at separate locations. She wonders if birds are equally likely to visit each of the feeders.
Marianna [84]

Answer:

the x² test statistic 13.71

Option a) 13.71 is the correct answer.

Step-by-step explanation:

Given the data in the question;

Feeder                     1      2      3       4

Observed visits; o_i  60   90   92    58

data sample = 300

Expected e_i = 300 / 4 = 75

the x² test statistic = ?

X^2_{stat = ∑[ (o_i - e_i)²/e_i]

X^2_{stat = [ (60 - 75)² / 75 ] + [ (90 - 75)² / 75 ] + [ (92 - 75)² / 75 ] + [ (58 - 75)² / 75 ]

X^2_{stat = [ 3 ] + [ 3 ] + [ 3.8533 ] + [ 3.8533 ]

X^2_{stat = 13.7066 ≈ 13.71

Therefore, the x² test statistic 13.71

Option a) 13.71 is the correct answer.

7 0
2 years ago
Use the table, graph, and equation to answer the following questions about
Alexxandr [17]
The answer is letter b. $5 for 1 sub!
4 0
2 years ago
The data represents the height, in feet, of various buildings. Find the Interquartile Range.
N76 [4]

Answer: 6

Step-by-step explanation:

7 0
2 years ago
How to solve X - 1v+ 4 + 7y - 3
Nostrana [21]
The first step to solving this is to remember our mathematical rules. They state that when the term has a coefficient of -1,, the number doesn't have to be written but the sign needs to remain. This will change the expression to the following:
x - v + 4 + 7y - 3
Now subtract the numbers 4 and 3 from each other.
x - v + 1 + 7y 
Since this expression cannot be simplified any further,, the correct answer to your question would be x - v + 1 + 7y.
Let me know if you have any further questions.
:)
3 0
2 years ago
what dose a point represents: a) line segment b) a location c) intersection of a plane d) none of the above
meriva

Answer:

(B) A location

Step-by-step explanation:

If you have a point on a graph or number line, it always represents a certain location on the graph.

For instance, if we have a point on the x=3 line and the y=4 line, the point would represent the location (3,4).

Hope this helped!

6 0
3 years ago
Other questions:
  • Jon has to pay $7.00 admission for the skating rink and $1.50 per hour to rent rollerblades. How many hours can he skate for $19
    10·1 answer
  • Select the correct answer.
    8·1 answer
  • Solve and show work for (x+2)(2x+5)=0
    6·1 answer
  • Over the next 15 months you have to read at least 75 books. You have to read x books per month. The inequality "15x is greater t
    14·1 answer
  • Two identical square pyramids were joined at their bases to form the composite figure below.
    10·2 answers
  • Is the graph of y=3/2x-4 paralel to the graph of y=-3/2x-4
    11·1 answer
  • How do you multiply mixed fraction like this one?<br><br> 2 3/4 x 3 1/2<br> Somoene help me please
    12·2 answers
  • PLEASE HELP ME! I NEED THIS BY TODAY. IF YOU DO NOT KNOW THE ANSWER, DO NOT REPLY!
    11·1 answer
  • I NEED A HAND ON THIS,PLEASE HELP: After entering the stadium all the fans wanted souvenirs. For every 2 people who bought progr
    12·2 answers
  • Help asap, The graph compares the total cost of buying movie tickets for members and nonmembers of a movie club
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!