Answer:
0.483
Explanation:
Given that you decide to test how accurate a certain TV station's weatherman is with his predictions.
No of days = 40
weatherman prediction of proportion= 0.60
Observed proportion =

p difference = -0.075

(Two tailed test)
Assuming H0 to be true, std error =

Test statistic Z = p difference/std error
= -0.7016
p value = 0.483