Let p denote the proportion of students at a large university who plan to purchase a campus

Question:

Let p denote the proportion of students at a large university who plan to purchase a campus meal plan in the next academic year. For a large-sample z test of H0: p = 0.20 versus Ha: p < 0.20, find the P-value associated with each of the following values of the z test statistic.
a. -0.55
b. -0.92
c. -1.99
d. -2.24
e. 1.40