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
Firdavs [7]
3 years ago
6

The test scores of a geometry class are given below.

Mathematics
2 answers:
sukhopar [10]3 years ago
7 0
Variance is the difference of the number from the mean of the group of numbers then square it and find the average. In this case, we need to find the mean first. 90 + 75 + 72 + 88 + 85 = 410/5 = 82 . Now we must get the difference of each from the mean. 
90 - 82 = 8
75 - 82 = -7
72 - 82 = -10
88 - 82 = 6
85 - 82 = 3
Next is to find the average of the square of the numbers.
(8^2) + (-7^2) + (-10^2) + (6^2) + (3^2) is
64 + 49 + 100 + 36 + 6 = 255. Next step is to simply divide it by 5. The numerator in calculating the variance is the sum of the square of the numbers which is 255.
Anni [7]3 years ago
4 0

Answer:

258

Step-by-step explanation:


You might be interested in
You roll a 6 sided cube, what is the probability of rolling a multiple of 2 or a number greater than 3?
vova2212 [387]
The probability of rolling a multiple 2 or a number greater than 3 is 1/3
7 0
3 years ago
Read 2 more answers
A first number is nine less than a second. The sum of the numbers is 45. Find the numbers.
oee [108]

Answer:

The first number is <u>18</u> and the second number is <u>27</u>.

Step-by-step explanation:

Given:

A first number is nine less than a second.

The sum of the numbers is 45.

Now, to find the numbers.

Let the second number be x.

And the first number be x-9.

The sum of the both numbers is 45.

According to question:

(x-9)+x=45.

⇒ x-9+x=45.

⇒ 2x-9=45.

<em>Adding both sides by 9 we get:</em>

⇒ 2x=54.

<em>Dividing both sides by 2 we get:</em>

⇒ x=27.

<u><em>The second number = 27</em></u>.

Now, to get the first number we put the value of x:

x-9

=27-9

=18.

Therefore, the first number is 18 and the second number is 27.

4 0
3 years ago
Last week Julia ran 30 miles more than Pranav.Julia ran 47 miles.How many miles did Pranav run?
andrew-mc [135]
17 miles as it is 47-30
8 0
3 years ago
What percent of 70 is 28?
Mumz [18]

Answer: 40%

Step-by-step explanation:

This represents this equation:

70*x =28

x=28/70=0,4

Multiply that with 100 to get the percentage.

5 0
3 years ago
Read 2 more answers
Can someone please help I really need help
slamgirl [31]

1 pound = 16 ounces.

9 pounds of sand x 16 = 144 total ounces of sand.

144 ounces / 6 ounce bottle = 24

He made 24 bottles.

3 0
3 years ago
Read 2 more answers
Other questions:
  • A sports arena can hold 18500 people, plus or minus 1200 people. Write an absolute value equation to represent the number of peo
    15·1 answer
  • What is the inequality that represents the range of the function g(x)=-3/4x^2 when the domain is restricted to -4
    9·1 answer
  • If f(x) = 4x and g(x) = 2x – 1, what is g(f(–2))?<br><br> A-17<br> B-13<br> C-8<br> D-5
    9·1 answer
  • You have 24 candy you ate 3/4 how much you have leaft
    11·2 answers
  • Round 3.751 to the nearest tenth.
    6·2 answers
  • What is the solution to -122 &lt; -3(-2-8x) -8x
    7·1 answer
  • At 12:45 Jimmy left his home in Pinetrees and cycled to visit his grandmother in Oakville. On his
    7·1 answer
  • One inch equals 2.54cm.A ribbon 100in.long is how many cmlong?​
    12·2 answers
  • Please help asap!!!!!!!!!!!!!!!!!!!!
    8·2 answers
  • NEED HELP ASAP WILL GIVE HIGH REWARD
    11·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!