If the angle $\theta$ is such that $2\pi \le \theta \le 4\pi$ and $\cos\theta = -\frac7{25},$ what is the value of $\sin\frac\theta2?$

The evening newspaper is delivered at a random time between 5: 30 and 6: 30 pm. dinner is at a random time between 6: 00 and 7: 00 pm. each spinner is spun 30 times and the newspaper arrived 19 times before dinner. determine the experimental probability of the newspaper arriving before dinner.