Recall the formula for TCP throughput for long connections

Average TCP Throughput $=1\mathrm{.}22*$Segment Size $/($RTT $*$ P$1/2)$

Where P is the packet error probability. Suppose that Segment Size is $1500$ Bytes and RTT is $100$ms$.$

what is the probability of a bit error that results in this average throughput?

Recall that if one bit has an error, then the whole packet has an error. Therefore, the probability that a packet has no errors is the probability that no bits have errors, and is $(1-$pbitError$)$bitsPerPacket$.$ Hence, the packet error probability $=1-(1-$pbitError$)$bitsPerPacket$)$