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x ¯ = Σ x n = 492 50 = 9.84 {\displaystyle {\bar {x}}={{\Sigma x} \over n}={492 \over 50}={9.84}}
30 − 0 = 30 {\displaystyle 30-0=30}
Q 3 − Q 1 = 15 − 5 = 10 {\displaystyle Q_{3}-Q_{1}=15-5=10}
N a v = Σ x n {\displaystyle N_{av}={{\Sigma x} \over {n}}}
± 7 {\displaystyle \pm 7}
1.5 ∗ I Q R = 1.5 ∗ 10 = 15 {\displaystyle 1.5*IQR=1.5*10=15}
Q 1 − 15 = 5 − 15 = − 10 {\displaystyle Q_{1}-15=5-15=-10}
Q 3 + 15 = 15 + 15 = 30 {\displaystyle Q_{3}+15=15+15=30}
σ = ( x 1 − x ¯ ) 2 + ( x 2 − x ¯ ) 2 + . . . + ( x n − x ¯ ) 2 n ≈ 8.083 {\displaystyle \sigma ={\sqrt {{(x_{1}-{\bar {x}})^{2}+(x_{2}-{\bar {x}})^{2}+...+(x_{n}-{\bar {x}})^{2}} \over {n}}}\approx {8.083}}
σ {\displaystyle \sigma }
x ¯ ± σ ≈ 9.84 ± 8.083 ≈ 17.923 , 1.757 {\displaystyle {{\bar {x}}\pm \sigma }\approx {9.84\pm 8.083}\approx {17.923,1.757}}
m a r g i n e r r o r ≈ ± 1 n ≈ ± 1 50 ≈ 0.141 ≈ 14.14 % {\displaystyle {margin_{error}}\approx {\pm {1 \over {\sqrt {n}}}}\approx {\pm {1 \over {\sqrt {50}}}}\approx 0.141\approx 14.14\%} Help:Displaying a formula
Help:Displaying a formula
