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
pav-90 [236]
3 years ago
6

An elementary school class ran 1 mile in an average of 11 minutes with a standard deviation of 3 minutes. Rachel, a student in t

he class, ran 1 mile in 8 minutes. A junior high school class ran 1 mile in an average of 9 minutes, with a standard deviation of 2 minutes. Kenji, a student in the class, ran 1 mile in 8.5 minutes. A high school class ran 1 mile in an average of 7 minutes with a standard deviation of 4 minutes. Nedda, a student in the class, ran 1 mile in 8 minutes. Who is the fastest runner with respect to his or her class?
Mathematics
1 answer:
EleoNora [17]3 years ago
8 0

Answer:

Rachel

Step-by-step explanation:

We need to measure how far (towards the left) are the students from the mean in<em> “standard deviations units”</em>.  

That is to say, if t is the time the student ran the mile and s is the standard deviation of the class, we must find an x such that

mean - x*s = t

For Rachel we have

11 - x*3 = 8, so x = 1.  

Rachel is <em>1 standard deviation far (to the left) from the mean</em> of her class

For Kenji we have

9 - x*2 = 8.5, so x = 0.25

Kenji is <em>0.25 standard deviations far (to the left) from the mean</em> of his class

For Nedda we have

7 - x*4 = 8, so x = 0.25

Nedda is also 0.25 standard deviations far (to the left) from the mean of his class.

As Rachel is the farthest from the mean of her class in term of standard deviations, Rachel is the fastest runner with respect to her class.

You might be interested in
A line with a slope of -3 that passes through the point (-2, 6)
scZoUnD [109]
I believe the equation is y = -3x + 0
3 0
2 years ago
Inverse square root (x+3)​
QveST [7]

Answer:

The inverse function is f(x) = x^2 - 3

Step-by-step explanation:

To find the inverse of any function, start by switching the x and f(x) values.

f(x) = √(x + 3)

x = √(f(x) + 3)

Now solve for the new f(x). The result will be your inverse function.

x = √(f(x) + 3)

x^2 = f(x) + 3

x^2 - 3 = f(x)

8 0
3 years ago
Please help I will mark previous
yawa3891 [41]

Answer:

Im sorry! idk the answer but if you have a phone, there is this app called photo math, or ask you mom or dad for help.

Step-by-step explanation:

8 0
3 years ago
I need help asap guys please I’ll give brainlest to help you out
Maru [420]

Answer:

Table c mate

Step-by-step explanation:

4 0
3 years ago
Read 2 more answers
Which linear function has the steepest slope
julia-pushkina [17]

Answer: A) y=-8x+5

A) m= -8

B) m= -2

C) m= 7

D) m= 6


4 0
3 years ago
Read 2 more answers
Other questions:
  • How many ways can an employer send 3 employees to a job fair if she has 11 employees?
    13·1 answer
  • Write an equation of the line that is parallel to -x + y = 5 and passes through the point (2,-5).
    11·2 answers
  • How do you write 8.11 as an improper fraction
    8·1 answer
  • 2/ 4/5 in simplest form
    6·1 answer
  • What is the answer to this question, Log 5 + log 2=
    14·2 answers
  • Best Answer gets BRAINLIEST!!!
    10·2 answers
  • 1.8 minus 3.7 x = negative 4.2 x + 0.3?
    5·1 answer
  • Determine the value of x (ill give brainliest)
    10·2 answers
  • What is 8% of 24?<br><br><br><br> im just putting this here bc it too short
    13·1 answer
  • 55<br> m+<br> (x + 25)<br> р<br> Find the value of x for which m|P.
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!