Concept:Mean deviation is the average of the absolute differences between each data value and the arithmetic mean.Explanation:The first five prime numbers are 2,3,5,7,11.Number of values is n=5.Arithmetic mean: xˉ=52+3+5+7+11=528=5.6.Absolute deviations from the mean are:∣2−5.6∣=3.6∣3−5.6∣=2.6∣5−5.6∣=0.6∣7−5.6∣=1.4∣11−5.6∣=5.4.Mean deviation is given by M.D=n∑∣x−xˉ∣.Sum of absolute deviations: 3.6+2.6+0.6+1.4+5.4=13.6.Therefore, M.D=513.6=2.72.Answer:The mean deviation is 2.72, which is option A.