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
GrogVix [38]
2 years ago
5

The scores on an exam are normally distributed, with a mean of 75 and a standard deviation of 5. What percent of the scores are

less than 80?
A. 50%
B. 84%
C. 13.5%
D. 16%
Mathematics
1 answer:
stellarik [79]2 years ago
5 0

Answer:

B. 84%

Step-by-step explanation:

Given

Mean= π=75

Standard Deviation= σ=5

As we have to calculate the percentage of score less than 80, we will find the z-score of 80

z=(x-μ)/σ

=  (80-75)/5

=5/5

=1

The z-score table value for 1 is 0.8413.

For converting this value into percentage, the value will be multiplied by 100.

So,

Percentage of students whose score is less than 80 = 0.8413*100

=84.13%

Rounding off gives us : 84%

So option B is the correct answer..

You might be interested in
Under what operations are the set of integers closed? Explain your answer.
Nonamiya [84]
Addition, subtraction, multiplication.

Addition: The addition of two integers produces another integer.

Subtraction: The subtraction of two integers produces another integer.

Multiplication: The product of two integers is an integer.

Division between two integers can produce a rational number that is not in the set of integers e.g. 1/3

This only includes the four basic arithmetic operations, you can include exponentiation and the modulo operation if you want to for the same reasons as above.
3 0
2 years ago
The time X it takes Hattan to drive to work on a randomly selected day follows a distribution that is approximately Normal with
alexdok [17]

Answer:

Shape: Approximately Normal

Center: 20 minutes

Variability: 6.5 minutes.

4 0
3 years ago
It took Michala 4 hours to sew 9 scarfs. How many scarfs could she make in 24 hours
aksik [14]
<h2>4 hours → 9 scarfs</h2><h2>8 hours → 18 scarfs</h2><h2>12 hours → 27 scarfs</h2><h2>16 hours → 36 scarfs</h2><h2>20 hours → 45 scarfs</h2><h2><u>24 hours → 54 scarfs</u></h2><h2><u /></h2><h3>Therefore, Michala can sew 54 scarfs in 1 day.</h3>
3 0
2 years ago
PLS HELPPPPP DUE TODAYYYY
Dafna1 [17]

1. y=4x

2. y=-7x-8

3. y=5x+63

4. y=¾x+8

5. y=-3x-½

6. y=1x-3

7. y=2

8. y=-2x+1

9. y=4x+7

wor<u>k for 9</u>

1=4(2)+b

1= 8 +b

-8 -8

7=b

10. y=0

11. y=¾x+6

<u>work </u><u>for </u><u>1</u><u>1</u>

<em>9</em><em> </em><em>=¾(4)+b</em>

<em>=¾(4)+b9</em><em> </em><em>= 3</em><em> </em><em> </em><em> </em><em>+b</em>

<em>+b-3=-3</em>

<em>+b-3=-3 6=</em><em>b</em>

<em>1</em><em>2</em><em>.</em><em> </em><em>sorry </em><em>I </em><em>haven't</em><em> </em><em>done </em><em>thai </em><em>one </em><em>in </em><em>a </em><em>while.</em>

<em>I </em><em>was </em><em>too </em><em>lazy </em><em>to </em><em>include</em><em> </em><em>the </em><em>work </em><em>for </em><em>the </em><em>first </em><em>couple</em><em> </em><em>of </em><em>answers</em><em> </em><em>although</em><em> </em><em>I </em><em>recommend</em><em>.</em><em> </em>

<em>M</em>

<em>A</em>

<em>T</em>

<em>H</em>

<em>W</em>

<em>A</em>

<em>Y</em>

<em>they </em><em>include</em><em> </em><em>work </em><em>with </em><em>ads</em>

6 0
3 years ago
You choose two different songs on a music playlist at random. Out of 80 songs on the playlist, 36 are hip hop songs. The first s
dexar [7]

Answer:

35/79

Step-by-step explanation:

Assuming you can't choose the same song a second time, the probability is 35/79.

If you can choose the same song, the probability is 36/80, which reduces to 9/20.

7 0
3 years ago
Other questions:
  • The domain for f(x) and g(x) is the set of all real numbers.
    9·1 answer
  • What is the slope and equation of a line parallel to the x-axis passing through point (5,8)
    14·2 answers
  • Half of G Multiplied by t squared is equal to its area A divided by its width w
    14·1 answer
  • The area of a square is 144 square centimeters. Find the length of the diagonal. Write your answer in simplest radical form.
    10·1 answer
  • What are some abundant numbers
    10·1 answer
  • Convert the given radian measure to a degree measure. 1.1π
    7·1 answer
  • Is the following a function? (2,5),(-9,5), (1,8), (3,2), (-2,1)? <br> A.yes<br> B.no
    7·2 answers
  • Help anyone would gladly appreciate it
    8·1 answer
  • I need help…. Please help :)
    8·1 answer
  • Which of the following would best be solved using factoring the difference of squares? 2² + 3x - 10 = 0 O 3r² + 12x = 8 2³ +52²
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!