$($c$)$ A network connection operates in half$-$duplex mode. A poll and its response takes eight bytes. The network data rate is $9600bps$ and the modem connection time its $8mS.$ Determine the:

$($i$)$ number of polls per second if there is no data to send;

$($ii$)$ average delay time required to send data messages of $150$ bytes from the cast of eight secondary stations to the primary stations.