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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:


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Paha777 [63]
Half of the cards in the deck of 52 are red. There are 14 cards that are both red AND greater than 6. 14/52≈0.27. Hope this helps!
7 0
3 years ago
The aspect ratio is used when calculating the aerodynamic efficiency of the wing of a plane. For a standard wing area, the
Lesechka [4]

Answer:

Y=s^2/36 and y=5.7;14.3 ft

Step-by-step explanation:

A(s)=s2/36 is the function. A(s) is the aspect ratio, while s is the wingspan. A(s) = 5.7 if one glider has an aspect ratio of 5.7. We'd want to know the glider's wingspan. By replacing A(s) with Y, we get the following equation system:

  • Y=s^2/36    
  • with y = 5.7
  • 5.7 = s^2/36    
  • 5.7*36 =  s^2
  • √205.2 = s
  • 14.3 ft
7 0
2 years ago
Find the area of the following rectangle​
lorasvet [3.4K]

Answer: x+8

Step-by-step explanation:

4 0
3 years ago
Write an equation (the bottom square on the left is 3/2 btw) I WILL GIVE BRAINLIST IF ANSWER IS RIGHT
madreJ [45]
W is 3.5/2 in fraction and 1.75 ind decimal
8 0
3 years ago
What is the 31st term in the sequence below?<br> -108,-90,-72,-54
Anna71 [15]
Add 18 each time
first term is -108

an=a1+d(n-1)
d=common difference
a1=startng term

an=-108+18(n-1)

31 term
a31=-108+18(31-1)
a31=-108+18(30)
a31=-108+540
a31=432


31st term is 432
8 0
3 years ago
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