(. 1).
. 1.
, , ( , , , ..). 0 t 1 ( 1) , , . .
t 1 t 2 , . 2 l = const.
(, , , ..) , . , . ( 3), .
.
, .
0 t0
P(t0) = P(0, t0) = P(t ³ t0) = 1 F(t) = 1 ò f(t) dt,
P(t0) , t, t = 0, , t0; F(t) () t; f(t) () t.
0 t0
Q(t0) = Q(0, t0) = P(t < t0) = 1 - P(t0) = F(t),
Q(t0) , t0, t = 0, , t0.
, , 0 t, , , (t) Q(t).
, , .
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l(t) = f(t) / (t).
t , , .. .
:
T = ò t f(t) dt = ò P(t) dt.
( ). . .
TP = q1 + q2 + qi + qn = åqi,
qi 1, 2, n- .
, , , , .. l = const.
.
P(t) = 1 F(t) = lt (1)
Q(t) = 1 lt
f(t) = l×lt.