Brockton (Mass.) Credit Union hired Scudder Defined Contribution Services to invest and administer $8 million in 401(k) and money purchase pension plan assets, said Debra Chambers, a spokeswoman. The plans 180 participants will have a choice of seven investment options from Scudder. They are: Cash Investment Trust, Income Fund, Balanced Fund, Growth & Income, International Fund, Large Company Growth Fund and Value Fund. Ms. Chambers declined to identify the previous administrator and investment adviser to the plan.