The formula for the standard deviation of a sample (s) is given by:
s =√(⅟₍n₌₁₎Σ(y-ȳ)²)
where y are the data points and ȳ is their mean; it can be rearranged to give:
s = √(⅟₍n₌₁₎(Σy² - n((Σy)/n)²)
→ s = √(⅟₍₅₌₁₎(1815 - 5(⁹⁵/₅)²)
→ s = √(¼ × 10)
→ s = √2.5
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you do this by 18*18
The number is -9 because (-9/-9) -18 = -17
1 + 17 = 18 5 + 13 = 18 7 + 11 = 18
18
17 divide by 7 = 2.4285714285714284