You can
put this solution on YOUR website! .
(a) You may use your regular calculator. The function to use is normalcdf
p = normalcdf(-0.55, 0.4, 0, 1) = 0.3643. ANSWER
Or use free of charge online calculator at
https://davidmlane.com/hyperstat/z_table.html
which I highly recommend.
(b) is UNREADABLE. It is UNCLEAR what you want.