You can put this solution on YOUR website! if the critical z-score is 1.04, then:
the probability of getting a z-score to the left of that critical value would be equal to .8508300289.
the probability of getting a z-score to the right of that value would be equall to 1 - that = .1491699711.
the probability of getting a z-score greater than minus that z-score and less than that z-score = .70166000579
here's what it looks like on the calculator at https://davidmlane.com/hyperstat/z_table.html
p(z less than 1.04)