Answer:
= 3.29
Step-by-step explanation:
Let call the length needs to be found is q
We have Law of Cosine:
q =
= 
= 3.29
The length can be found using the Law of Cosines is 3.29
<u>Given</u>:
Mean,

Standard deviation,

The Chebyshev theorem will be used for the solution of the given query,
i.e., 
(i)
⇒ 

The lower limit will be:
= 
= 
= 
The upper limit will be:
= 
= 
= 
hence,
The 75% houses sold are between:
⇒ (200000, 400000)
(ii)
⇒ 
By putting the values, we get





now,
⇒ 


(%)
hence,
88.88% houses sold between 150000 and 450000.
(iii)
⇒ 
By putting the values, we get





now,
⇒ 

(%)
hence,
85.21% houses are sold between 170000 and 430000.
Learn more:
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PEMDAS
doing the stuff in the parenthesis first
71.1 - 2.27 x (2)4
then multiply left to right
71.1 - 4.54*4
71.1 - 18.16
52.94
therefore 52.94 should be your answer
4.While not rounding the answer is 500°