a gym has

$2$

$5$

$$bikes for an evening class.

$1$

$0$

$$bikes are always booked by regular gym members on a long term deal but the reminder can be booked by anybody. The bookings for the remaining available bikes vary $-$ over the last $10$ eveings $9,12,6,11,8,10,8,6,9$ and $7$ of the remaining bikes were booked. to one decimal place how many unbooked bikes were there per evening on avareage over the last $10$ days