answer.
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
arsen [322]
2 years ago
7

The distribution of raw scores on a particular achievement test has a mean of 500500500 and a standard deviation of 808080. If e

ach score is increased by 252525, what will be the mean and standard deviation of the distribution of new scores?
Mathematics
1 answer:
Troyanec [42]2 years ago
6 0

Answer:

Mean will increase by 25 i.e. it will become 75.

And, Standard deviation will remain same i.e. 80.

Step-by-step explanation:

Since, Each score is increased by 25. So, the Mean will increase by 25 i.e. it will become 75. Example: Mean of {4, 5, 6, 7, 8} = 6

and if every observation will increase by 2 then Mean of {6, 7, 8, 9, 10} = 8.

Thus, the Mean will also increase by 2.

Also, Standard deviation measures the dispersion(scatter) of data and it is the distance from the mean. Since there is no change in distance. Thus there will be no change in standard deviation.

Further, Mean is used to measure the central tendency of data which represents the whole data in the best way. It can be found as the ratio of the sum of all the observations to the total number of observations.

Standard Deviation is the square root of the sum of square of the distance of an observation from the mean.

You might be interested in
Select two ratios that are equivalent to 6:106:106, colon, 10. Choose 2 answers: Choose 2 answers: (Choice A) A 20:1220:1220, co
Eva8 [605]

Answer:

C. 3 : 5

D. 24 : 40

Step-by-step explanation:

Select two ratios equivalent to 6 : 10

Checking all options

A. 20 : 12

20 / 12

= 10 /6

= 10 : 6

B. 32 : 50

= 32 / 50

= 16 / 25

C. 3 : 5

3 / 5

= 6 / 10

3/5 is equivalent to 6 / 10

D. 24 : 40

24 / 40 = 12 / 20

= 6 / 10

= 6 : 10

Options C and D are correct

5 0
2 years ago
(PLEASE HELP URGENT!)
Olin [163]
x              f(X)        g(x)
2.5            2           1.25
1.5            0          -2.75
2.75        2.5         2.56
2.8          2.6         2.84
2.77        2.54       2.67
2.73        2.46       2.45  <<<<<<< Answer.

I've included a graph to show you another way that you could get closer quicker.

The red line is y = 2x - 3
The blue line is y = x^2 - 5

8 0
2 years ago
Which function has zeros at x = 10 and x = 2? f(x) = x2 – 12x + 20 f(x) = x2 – 20x + 12 f(x) = 5x2 + 40x + 60 f(x) = 5x2 + 60x +
Allushta [10]

Answer:

x^2 -12x+20

Step-by-step explanation:

If the zeros of the functions are at 10 and 2

(x-10) (x-2)

FOIL

x^2 -2x-10x+20

Combine like terms

x^2 -12x+20

3 0
2 years ago
Read 2 more answers
A coffeehouse charges a flat rate,r, for each hour customer wants to use the internet. Enter an equation to express the total co
sweet-ann [11.9K]

Answer:

c=rt is the equation to express the total cost c to use the internet at the coffeehouse for t hours.

Step-by-step explanation:

Given A coffeehouse charges a flat rate, r for each hour customer wants to use the internet. we have to write the equation to express the total cost c to use the internet at the coffeehouse for t hours.

Charges of internet per hour = r

Total hour = t hours

Hence, Cost = (Charges per hour)(Total hours)

                     =r\times t

∴ c=rt

which is the linear equation to express the total cost c to use the internet at the coffeehouse for t hours.

5 0
2 years ago
Justin is exchanging dollars for rolls of quarters and rolls of dimes at a bank. Each roll of quarters has a value of $10 and ea
Vitek1552 [10]
Well, it really depends but it could be 9 rolls of quarters, 5 rolls of quarters and 8 rolls of dimes, 4 rolls of quarters and 10 rolls of dimes, 3 rolls of quarters and 12 rolls of dimes, etc.
6 0
2 years ago
Read 2 more answers
Other questions:
  • Six pairs of socks cost as much as 1 coat, 2 pairs of jeans cost as much as 3 pairs of shoes, and 4 pairs of socks cost as much
    10·1 answer
  • Alisa buys a watermelon every year. The first time she bought a watermelon, it cost $2.50. She notices the price is getting more
    15·1 answer
  • Ella has 50 stacks of ten pennies in each stack described how to find how many pennies ella has in all
    10·2 answers
  • Horn lengths of Texas longhorn cattle are normally distributed. The mean horn spread is 60 inches with a standard deviation of 4
    14·1 answer
  • Nico dropped the brand new bottle of dog shampoo and 3 ounce spilled out. He measured 1 1/4 ounces each time he shampoos his dog
    6·2 answers
  • Last week, burton paid $36.80 for 11 1/2 gallons of gas this week he bought 9 1/4 gallons of gas. The cost per gallon of gas inc
    15·2 answers
  • Sara can run 49 yards in 7 seconds. At that rate, how many feet can she run in 3 minutes?
    8·2 answers
  • 1. Jacob opens an online-only savings account and deposits $50 each month. The annual interest rate is
    6·1 answer
  • Geometry:
    9·1 answer
  • A die used in a certain board game has eight faces, of which 3 are red, 3 are yellow, and 2 are blue. Each face is equally likel
    10·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!