Calculate the polydispersity index for $($i$)$ polystyrene $($ii$)$ PVC $($iii$)$

Polyacrylic acid $($iv$)$ Polyethylene $($v$)$ polyacrylonitrile $($vi$)$ Polyacrylonitrile if

each polymer of them consists of $10$ chains $0$f $10000$ repeating unit, $1000$

chains of $10$ repeating unit.