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
givi [52]
3 years ago
6

A set of N = 20 exam scores has a mean of m = 50. The instructor discovered that an error was made grading one exam, so 20 point

s are added to that student's score. After adding the 20 points, what is the new mean for the class? Hint: Write down the formula for the mean and fill in all known information. What is the new mean for the class?
Mathematics
1 answer:
tatuchka [14]3 years ago
8 0

Answer:

The new mean for the exam scores is 51

Step-by-step explanation:

the mean can be calculated using the formula

mean of scores = \frac{Sum total    of scores}{Number of students}

before the 20 points was added, the mean of the score was = 50.

Inserting this into the formula, we have:

50 = \frac{Sum total}{20 students}

from this, we can compute the sum total of the scores as

sum total = 50 × 20 = 1000

when the extra 20 marks is added, the sum of the entire scores will be changed to 1000 + 20 = 1020.

Hence the new mean will be computed as (New Sum total of scores / Number of students)

= \frac{1020}{20} = 51.

∴ The new mean of the scores is = 51

You might be interested in
Order the following from least to greatest 0.222, 1/5, 0.02
lorasvet [3.4K]
1. Put all values in decimals

0.222=0.222

1/5= 0.2

0.02= 0.02

2. Order the cakes from least to greatest

0.02, 0.2, 0.222


Hope this helps!
6 0
3 years ago
Read 2 more answers
What is 3X^2 × 2X^3​
irinina [24]

Answer:

Step-by-step explanation:

3x^2 * 2x^3= 6x^5

Multiply the 3 and 2 to get 6. Add the exponents.

6 0
3 years ago
PLEASE HELP. I NEED HELP, I NEEEEEEED HELP
yuradex [85]

Answer:

1. r is point

2.PQ is ray

3. pr is line

4. p.q,r is collnear points

5. QR is segment

6 0
3 years ago
A tree is 28.05 feet tall. What is its height in meters? Use the following conversion: 1 meter is 3.3 feet.
Mariulka [41]

Answer:

It is 8.5 meters tall

Step-by-step explanation:

28.05 / 3.3 = 8.5

3 0
2 years ago
Andre builds a form for a new cement step in the shape of a rectangular prism. The form he builds is 40 and 1/2 inches long, 10
posledela

Answer:

3240 in^3

Step-by-step explanation:

Step one:

given data

The dimension of the form

Length 40 and 1/2 inches long,

Depth 10 inches deep,

The width and 8 inches high

Step two:

The amount of cement is equivalent to the volume of the form

V=L*W*H\\\\V=40.5*10*8\\\\V=3240 in^3

Hence the volume of cement is 3240 in^3

8 0
3 years ago
Other questions:
  • Two questions,
    14·1 answer
  • Help its geometry pleaseeee​
    5·1 answer
  • 5. Which of the following linear functions has a graph which passes through points (−5,−2) and (−3,0)?
    15·1 answer
  • When a product of intergers has an even number of negative factors then the sign of the product is what
    10·1 answer
  • Alkali metals, alkaline earth metals, and aluminum all form ions with positive charges equal to
    11·2 answers
  • Eddie is practicing wind sprints during his summer break. He’s able to run 72 meters in 12 seconds. If d represents distance and
    5·2 answers
  • Determine f(-1) if the graph of f(x) is given below.
    7·1 answer
  • Find the surface area of the triangular prism shown below.
    6·1 answer
  • 1. Ivan bought three magazines for $6.50 each. The sales tax was 7%. What
    9·1 answer
  • Scientists estimate there are 70,000 species insects in each acre of the
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!