求解下列的統計學問題！要付算式感謝大家 1.p(0<Z<0.43)？ 2.p(Z>0.43)? 3.p(-0.3<Z<1.12)? 4.(Z>A)=0.123,Z0=?

Z ~ N(0, 1)
主要是考你查表的技巧。

1.
P(0 < Z < 0.43)
= 0.6664 - 0.5
= 0.1664

2.
P(Z > 0.43)
= 1 - P(Z ≤ 0.43)
= 1 - 0.6664
= 0.3336

3.
P(-0.3 < Z < 1.12)
= P(-0.3 < Z < 0) + P(0 < Z < 1.12)
= P(0 < Z < 0.3) + P(0 < Z < 1.12)
= 0.1179 + 0.3686
= 0.4865

4.
P(Z > A) = 0.123, A = ?

P(Z > A) = 0.123
即
P(Z ≤ A) = 1 - 0.123 = 0.877
即
P(0 < Z ≤ A) = 0.877 - 0.5 = 0.377
看表可知 A = 1.16。

1.
P(0<Z<0.43)
=0.1664

2.
P(Z>0.43)
=0.5-P(0<Z<0.43)
=0.5-0.1664
=0.3336

3.
P(-0.3<Z<1.12)
=0.11791+0.36864
=0.48655

4.
P(Z>A)=0.123
0.5-P(0<Z<A)=0.123
P(0<Z<A)=0.377
A=1.16
P(Z<0)=0.5