Mixing An initial charge of particle $($A$)$ of $450$ gm is mixed with $550$ gm of particle $($B$)$ in a reactor. After $1$ minute of mixing five spot samples, each containing an average number of particles about $60$ particles, for the evaluation of the performance of the mixture, calculate: i$.$ the standard deviation ii$.$ the mixing index Is $,$ and the least value of the mixing index Is$,0.$ the mixing index after a time of $145$ seconds. iii. Sample Number of fraction of B $123450\mathrm{.}450\mathrm{.}500\mathrm{.}650\mathrm{.}550\mathrm{.}40$