Can someone help me with this?

Producing uniform parts, one worker's average monthly number of parts produced is 550 with standard deviation of 14 parts. Workers labor productivity form a normal distribution.

a) What percentage of workers make more than 700 parts per month?

b) Determine the minimum number of parts per month, for which production workwers may get a bonus money, if in the basis of the size of the bonus pool, you can reward only 17% of workers.

thanks in advance.