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
mote1985 [20]
3 years ago
8

The mean of 4 test scores is 90. What is the sum of the scores?

Mathematics
2 answers:
ollegr [7]3 years ago
6 0
To find a mean of a number or the average  you first would add all the test scores up. then divide by the number of the quantity there are.
* the quantity is 4
so before you divide by the quantity you already added the sum of the test so if you do the problem backward and instead of dividing by 4 you would multiply by 4. 

So 90 times 4 which is 360.
Thus the sum of the score is 360.
shepuryov [24]3 years ago
5 0
360. 
A general rule of thumb when dealing with questions like these is using the following equation:

(number of numbers) x (mean) = sum of numbers

Proof/Example: 7, 10, 13
There are 3 numbers here and the mean is 10. Multiply them together and you will get 30, just as you will get 30 from adding them together. 

In this case, there are 4 numbers and the mean is 90, so 4 x 90 = 360.
You might be interested in
What is this anyone ??
sammy [17]

Answer:

3.3 × 10^{9}

Step-by-step explanation:

I hope this helps!

5 0
3 years ago
Read 2 more answers
Pls help this is due really soon
lora16 [44]

Answer: I think that the answer is 100.

Step-by-step explanation: the line is straight and horizontal, and straight horizontal lines r 180 degrees, we already have 80 degrees so X is 100.

3 0
2 years ago
Read 2 more answers
Estimate of 137,638 and 52,091
maxonik [38]
140,000,,, 50,000 is estimated
5 0
2 years ago
Find the geometric sum: 40 + 20 + 10 + … + 0.078125
sveticcg [70]
S=40+20+10+\cdots+0.078125
S=40\left(1+\dfrac12+\dfrac14+\cdots+\dfrac1{512}\right)
S=40\left(1+2^{-1}+2^{-2}+\cdots+2^{-9}\right)

2^{-1}S=40\left(2^{-1}+2^{-2}+2^{-3}+\cdots+2^{-10}\right)

\implies S-2^{-1}S=40\left(1-2^{-10}\right)
\implies\dfrac12S=40\left(1-\dfrac1{1024}\right)
\implies S=80\left(1-\dfrac1{1024}\right)=\dfrac{5115}{64}=79.921875
4 0
3 years ago
The mean amount purchased by a typical customer at Churchill’s Grocery Store is $23.50, with a standard deviation of $5.00. Assu
m_a_m_a [10]

Answer: 0.0170

Step-by-step explanation:

Given : The mean amount purchased by a typical customer at Churchill’s Grocery Store is $23.50, with a standard deviation of $5.00.

i.e. \mu=23.50

\sigma=5

We assume the distribution of amounts purchased follows the normal distribution.

Sample size : n=50

Let \overline{x} be the sample mean.

Formula : z=\dfrac{\overline{x}-\mu}{\dfrac{\sigma}{\sqrt{n}}}

Then, the probability that the sample mean is at least $25.00 will be :-

P(\overline{x}\geq\25.00)=P(\dfrac{\overline{x}-\mu}{\dfrac{\sigma}{\sqrt{n}}}\geq\dfrac{25-23.50}{\dfrac{5}{\sqrt{50}}})\\\\=P(z\geq2.12)\\\\=1-P(z

Hence, the likelihood the sample mean is at least $25.00= 0.0170

5 0
3 years ago
Other questions:
  • What does 4r+6 represent in the expression
    7·2 answers
  • Bill wants to save up to buy a new watch which costs $235. If he already has $75 and he saves $8 each week, how many weeks will
    15·2 answers
  • A cylindrical tank is half-full of oil. The cylinder has a base radius of 100 cm. The height of the cylinder is 250 cm. How many
    14·2 answers
  • Which of the following choices is the standard deviation of the sample shown
    7·1 answer
  • Find the missing side of triangle 8,6
    6·2 answers
  • Help ? What’s the answer ?
    11·1 answer
  • Simplify the expression. (6x - 5) + (4x^2 - 3x + 4)
    8·2 answers
  • PLEASSSSSSE HELP ME!
    9·2 answers
  • Which of the following equations passes through the point (-2,-4) and is parallel to the x-axis .
    15·1 answer
  • Iain serves 3 cups of coffee every 4 minutes.
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!