A Cancer Research Group Surveys 100 Women More Than 40 $\alpha$

A cancer research group surveys 100 women more than 40 years old to test the hypothesis that 50% of women in this age group have regularly scheduled mammograms.Forty of the women respond affirmatively.Using $\alpha$ = 0.05,the null hypothesis is __________.

A) $\mu$ > 80
B) $\mu$ $\le$ 80
C) p > 0.50
D) p = 0.50
E) s ≥ 0.80