When there is high conformity and low deviance in a group, the group s performance

The group's performance is likely to be low because the group fails to change dysfunctional norms, when there is high conformity and low deviance in a group.
High-status deviance has such actions as making fewer contributions to task performance or exercising less influence in the group's discussion.

In the situation, the performance of a group is likely to be less because the group fails to modify dysfunctional/defective norms.

Conformity can be explained as the change in a behavior or belief of an individual to better fit in the group pressure. The pressure of group pressure can be seen in different forms, such as bullying, teasing, criticism and etc. While on the other side, deviance can be explained as a behavior that violates/ disobey expected rules of the society or group.  

To do this you have to make 667 into a decimal which gives you .67 then you multiply this by 850. This gives you 569.5 people.