Consider all the whole numbers from 0 to 1500. What is the sum of all digits needed to write down these numbers? No calculators
1 answer:
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Use the equation=
x^2+5^2=9^2
x^2+25=81
x^2+25-25=81-25
x^2=56
x=7.48331477355
x^2+5^2=9^2
x^2+25=81
x^2+25-25=81-25
x^2=56
x=7.48331477355
Solution :
Let :
X = number of overtime hours
S = total weekly salary
S =
S = 480 + 18X
E(S) =
= 750
Mean of S = 750
Var (S) =
Var(S) =
= 5184
Variance of S = 5184
The standard deviation equals square root of 5184 = 72