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
denis-greek [22]
2 years ago
14

On a standardized exam, the scores are normally distributed with a mean of 350 and

Mathematics
1 answer:
kondaur [170]2 years ago
3 0

Answer:

\boxed {\boxed {\sf z= -0.1}}

Step-by-step explanation:

A z-score helps describe the relationship between a value and the mean of a group of values. Basically, it tells us how many standard deviations away from the mean a value is. The formula is:

z= \frac{x- \mu}{\sigma}

where x is the value, μ is the mean, and σ is the standard deviation.

For this standardized exam, the mean is 350 and the standard deviation is 40. We want to find the z-score for a value of 346.

  • x= 346
  • μ= 350
  • σ= 40

Substitute the values into the formula.

z= \frac{ 346-350}{40}

Solve the numerator.

z- \frac{ -4}{40}

Divide.

z= -0.1

The z score is <u>-0.1</u>, so the person with a score of 346 on the exam was 0.1 standard deviations lower than the mean.

You might be interested in
Graph y &lt; 1 – 3x<br> Need this really fast
Ivenika [448]

Answer:

Step-by-step explanation:

Hope this helps

4 0
3 years ago
E Fill in the char...
Temka [501]
Das coo den den yu said the most recent series
4 0
3 years ago
BRAINLIESTTTT ASAP!!<br><br> please answer<br> theres 2 questions
olasank [31]
1- 6/15 2-104/312 You just do rise over run!!!
3 0
3 years ago
Your friend tells you that if you let her keep 2020 of your Pokemon cards for three months, she will give you 22 cards extra whe
Dmitrij [34]

Answer: 40 %

Step-by-step explanation:

Let the amount of one card = x

Hence, the value of 20 cards ( Principal amount ) = 20x

And, the value of 22 cards ( Total amount after 3 month ) = 22x

⇒ Total interest in 3 month = 22x - 20x =2x

Let the annual interest rate = r %

\frac{20x\times r\times 3/12}{100}=2 x ( By the formula of simple interest rate )

\implies \frac{10\times r\times 1/4}{100}=1

\implies \frac{10r}{400}=1

\implies 10r=400

\implies r=40\%

Hence, the annual rate of interest = 40%

8 0
3 years ago
Andy has $310 in his account. Each week, w, he withdraws $30 for his expenses. Which expression could be used if he wanted to fi
Furkat [3]

Answer:

310 - 3w

310 - 3(80) = $70

Step-by-step explanation:

310 - 30w

w = 8

310 - 30(8)

310 - 240

= 70

6 0
3 years ago
Read 2 more answers
Other questions:
  • What is the range of function y=√(-2cos^2x+3cosx-1)
    14·1 answer
  • The hook on a fishing line is 6 inches below sea level.
    10·2 answers
  • Suppose the manager of a gas station monitors how many bags of ice he sells daily along with recording the highest temperature e
    8·1 answer
  • What unit would be best to use for measuring the weight of a stapler
    14·1 answer
  • What is the standard form of the equation y=-5/2x-3 ?
    9·1 answer
  • The number name of 70080067 <br>In Indian System​
    10·1 answer
  • Which number is divisible by 9? <br><br> 121<br> 137<br> 127<br> 144
    12·2 answers
  • PLEASE YALL I need HELP ASAP PLEASE PLEASE PLEASE I WILL MARK YOU AS BRANLIEST IF CORRECT
    15·2 answers
  • Help me with this!!! I will mark Brainliest
    10·1 answer
  • HELP PLEASE?? not sure about it!!
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!