One-Way ANOVA Is Performed on Independent Samples Taken from Three

Multiple Choice

One-way ANOVA is performed on independent samples taken from three normally distributed populations with equal variances.The following summary statistics were calculated: $$\begin{array} { l l l } n _ { 1 } = 6 & \bar { x } _ { 1 } = 50 & s _ { 1 } = 5.2 \\n _ { 2 } = 8 & \bar { x } _ { 2 } = 55 & s _ { 2 } = 4.9 \\n _ { 3 } = 6 & \bar { x } _ { 3 } = 51 & s _ { 3 } = 5.4\end{array}$$ The grand mean equals:

A) 50.0.
B) 52.0.
C) 52.3.
D) 53.0.