(1)表中各个频率是 996 1000 =0.996, 1496 1500 =0.997, 1996 2000 =0.998, 2496 2500 =0.998, 2980 3000 =0.999;(2)由第(1)题的结果知出版社5次“读者问卷调查”中,收到的反馈信息是:读者对杂志满意的概率约是P(A)=(0.996+0.997+0.998+0.998+0.999)÷5=0.998.
(1)表中各个频率是 996 1000 =0.996, 1496 1500 =0.997, 1996 2000 =0.998, 2496 2500 =0.998, 2980 3000 =0.999;
(2)由第(1)题的结果知出版社5次“读者问卷调查”中,收到的反馈信息是:读者对杂志满意的概率约是P(A)=(0.996+0.997+0.998+0.998+0.999)÷5=0.998.