4178调查了某校1500个学生,其中900人是共青团员,如果以95%的置信程度进行估计,全市共青团员人数比率区间为().8688

A.(57.91%,62.09%

B.(57.80%,62.20%)

C.(58.74%,61.26%)

D.(57.52%,62.48%6)

答案解析