  We perform a Taylor series expansion of Tsallis distribution by assuming the
Tsallis parameter $q$ close to 1. The $q$ value shows the deviation of a system
from a thermalised Boltzmann distribution. By taking up to first order in
$(q-1)$, we derive an analytical result for Tsallis distribution including
radial flow. Further, in the present work, we also study the speed of sound
($c_s$) as a function of temperature using the non-extensive Tsallis statistics
for different $q$ values and for different mass cut-offs.
