Find the coefficient of variation
"C.V={SD \\over mean}\\times100"
"C.V\\ \\text{of\\ I}={15 \\over 50}\\times100=30"
"C.V\\ \\text{of\\ II}={12 \\over 48}\\times100=25"
"C.V\\ \\text{of\\ III}={2 \\over 12}\\times100\\approx16.67"
C.V for III is the least. Hence the batsman III is more consistent.
Evaluation criteria
Less C.V indicates more constant player (player III).
Player I has the highest runs score 50.
Arithmetic mean of batsman I is greater than that of batsman II.
But batsman II is a more consistent than batsman I (C.V of II =25%<30% = C.V of I).
I think that batsman I is to be selected.
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