The question is:

The general manager of a logistic consulting group believes that 28% of the firm's orders come from new customers. A simple random sample of 120 orders was taken. Assuming the manager's claim is valid determine (to 3 dec. places)

1. The standard error for the sampling distribution proportion (i got 0.041.. is that wrong?)

2. The probability that there is a difference of at least 3% between the percentage of new customers found by taking the sample and that claimed by the manager. (really don't not too sure how to do this one)