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(2012•宿迁)绿豆在相同条件下的发芽试验,结果如下表所示:每批粒数n100300400600100020003000发芽的粒数m9628238257094819122850发芽的频率mn0.9600.9400.9550.9500

题目详情
(2012•宿迁)绿豆在相同条件下的发芽试验,结果如下表所示:
每批粒数n 100 300 400 600 1000 2000 3000
发芽的粒数m 96 282 382 570 948 1912 2850
发芽的频率
m
n
0.960 0.940 0.955 0.950 0.948 0.956 0.950
则绿豆发芽的概率估计值是 (  )

A.0.96
B.0.95
C.0.94
D.0.90
每批粒数n 100 300 400 600 1000 2000 3000
发芽的粒数m 96 282 382 570 948 1912 2850
发芽的频率
m
n
0.960 0.940 0.955 0.950 0.948 0.956 0.950
每批粒数n 100 300 400 600 1000 2000 3000每批粒数n100300400600100020003000 发芽的粒数m 96 282 382 570 948 1912 2850发芽的粒数m9628238257094819122850 发芽的频率
m
n
0.960 0.940 0.955 0.950 0.948 0.956 0.950发芽的频率
m
n
m
n
m
n
mmnn0.9600.9400.9550.9500.9480.9560.950




▼优质解答
答案和解析
.
x
=(96+282+382+570+948+1912+2850)÷(100+300+400+600+1000+2000+3000)≈0.95,
当n足够大时,发芽的频率逐渐稳定于0.95,故用频率估计概率,绿豆发芽的概率估计值是0.95.
故选B.
.
x
.
.
.
.xxx=(96+282+382+570+948+1912+2850)÷(100+300+400+600+1000+2000+3000)≈0.95,
当n足够大时,发芽的频率逐渐稳定于0.95,故用频率估计概率,绿豆发芽的概率估计值是0.95.
故选B.