Question

Formuals of statistics ....

Answer 1

Formuals of statistics

$\boxed {\begin{minipage}{9.2 cm}\\  \dag \: \underline{\Large\bf Formulas\:of\:Statistics} \\ \\ \bigstar \: \underline{\rm Mean:} \\ \\ \bullet\sf M=\dfrac {\Sigma x}{n} \\ \bullet\sf M=a+\dfrac {\Sigma fy}{\Sigma f} \\ \\ \bullet\sf M=A +\dfrac {\Sigma fy^i}{\Sigma f}\times c \\ \\ \bigstar \: \underline{\rm Median :} \\ \\ \bullet\sf M_d=\dfrac {n+1}{2} \:\left[\because n\:is\:odd\:number\right] \\ \bullet\sf M_d=\dfrac {1}{2}\left (\dfrac {n}{2}+\dfrac {n}{2}+1\right)\:\left[\because n\:is\:even\:number\right] \\ \\ \bullet\sf M_d=l+\dfrac {m-c}{f}\times i \\ \\ \bigstar \: {\boxed{\sf M_0=3M_d-2M}}\end {minipage}}$

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Answer 2

• Population mean = μ = ( Σ Xi ) / N.
• Population standard deviation = σ = sqrt [ Σ ( Xi - μ )2 / N ]
• Population variance = σ2 = Σ ( Xi - μ )2 / N.
• Variance of population proportion = σP2 = PQ / n.
• Standardized score = Z = (X - μ) / σ