In order to find the number of women that ran faster than her, we first need to look at the z-table for the corresponding value for a score of 1.63.
Looking at the table, we have a value of 0.9484, so we have that Jean is faster than 94.84% of the women.
That means she is in the top 5.16% faster women, and that corresponds to:
So Jean is in the top 20 faster women, that means we have 19 women faster than her.