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
777dan777 [17]
1 year ago
8

The scores on a statistics test had a mean of 81 and a standard deviation of 9. One student was absent on the test day, and his

score wasn’t included in the calculation. If his score of 84 was added to the distribution of scores, what would happen to the mean and standard deviation?.
Mathematics
1 answer:
Rama09 [41]1 year ago
8 0

Using the definitions of the mean and of the standard deviation of a data-set, we have that:

  • The mean would increase.
  • The standard deviation would remain constant.

<h3>What are the mean and the standard deviation of a data-set?</h3>

  • The mean of a data-set is given by the <u>sum of all values in the data-set, divided by the number of values</u>.
  • The standard deviation of a data-set is given by the <u>square root of the sum of the differences squared between each observation and the mean, divided by the number of values</u>.

When the measure of 84 is added to the data-set, we have that:

  • A measure greater than the mean is added, hence the mean would increase.
  • The difference squared between 84 and the mean of 81 is of 9, which is the same as the standard deviation, which would remain constant.

More can be learned about the mean and the standard deviation of a data-set at brainly.com/question/26941429

#SPJ1

You might be interested in
Write in decimal form 7× 100+ how to solve step by step
LenKa [72]
Just count the number of zeros and move the decimal that many times . (ex: 7x100= 700 or 7x100.= 7.000
8 0
3 years ago
The scoring of modern IQ tests is such that IQs have a Normal distribution with mean
Readme [11.4K]

Answer:

114

Step-by-step explanation:

z = (x − μ) / σ

0.93 = (x − 100) / 15

x ≈ 114

4 0
3 years ago
What is 6÷2(1+2)<br><br>someone help ​
In-s [12.5K]
Hopes this helps:

Answer: 9

1. Simplify 1 + 2 to 3.

6 divided by 2 times 3


2. Simplify 6 divided by 2 to 3.

3 times 3


3. Simplify.

9
6 0
2 years ago
The length, in centimeters, of a diagonal of a rectangle is represented by the expression below.
TiliK225 [7]

Answer:

(C) 18 centimeters

4 0
2 years ago
Read 2 more answers
Mrs. Wong has 144 tiles that she is going to place on her square kitchen floor. If the tiles are $3.79 each, how much did Mrs. W
PolarNik [594]

Answer:

Mrs. Wong spend $545.76 on tiles.

Step-by-step explanation:

Mrs. Wong has 144 tiles that she is going to place on her square kitchen floor. If the tiles are $3.79 each, how much did Mrs. Wong spend on tile?

we are given

number of ties=144

cost of one tie=3.79 dollar

we have to find

total cost of 144 ties

for this we will multiply 144 by 3.79

multiplying 144 by 3.79 gives=144*3.79

it other words

one tile cost=$3.79

and for 144 ties cost

multiplying 144 on both sides

144 tiles cost=3.79*144=$545.76

8 0
3 years ago
Read 2 more answers
Other questions:
  • Tell whether x and y show direct variation. Explain your reasoning. If so, find k. y+3=x+6
    8·1 answer
  • Which of these points lies on the line described by the equation
    7·1 answer
  • Which types of lines match these equations? X = 2y + 6<br> 4y=2x-12
    11·2 answers
  • Melinda and Marcus are saving money to purchase a present for a friend. Each friend starts with an amount and also saves a speci
    13·2 answers
  • Alan is studying. The number of minutes he has studied varies directly with the number of calories he has burned. See the graph
    11·2 answers
  • Sleep deprivation, CA vs. OR, Part I. According to a report on sleep deprivation by the Centers for Disease Control and Preventi
    12·1 answer
  • Convert 123 percent into fraction​
    14·2 answers
  • URGENT QUESTION.
    12·1 answer
  • What is the image point of (2, -5) after a rotation of 90 degrees counterclockwise about the origin?
    11·1 answer
  • Identify the equations of ellipses whose major axis lengths are twice their minor axis lengths.
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!