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POISSONMIXT (2)
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POISSONMIXT (2)
POISSON...
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Alma Rosa Santi Bol
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DISTRIBUCIÓN DE PROBABILIDAD POISSON MATERIA: MATERIA: PROBABILIDAD Y ESTADISTICA ESTADISTICA DESCRIPTIVA TITULAR: ING. FELIPE SALINAS VELAZUEZ
La distribui!" d# $r%babi&idad $%iss%" #s disr#ta' &&a(ada as) #" (#(%ria d# Si(#%" D#"is P%iss%"*+,-+ +-/01' 2ti& $ara #sti(ar #& "2(#r% d# %urr#"ias #" u" i"t#r3a&% #s$#)4i% d# ti#($% % #s$ai%. C%(% $u#d# s#r #& "2(#r% d# aut%s 5u# arriba" a u"a #stai!" d# 6as%&i"a' ta(bi7" $u#d# s#r #& "2(#r% d# #"4#r(%s 5u# &a" a u" 8%s$ita& $ara s#r at#"did%s' #& "2(#r% d# d#4#t%s $%r ada (#tr% d# t#&a. Mi#"tras 5u# &a distribui!" Bi"%(ia& #st9 %ri#"tada a r#s%&3#r $r%b(as r#&ai%"ad%s %" &%s 7it%s #s$#rad%s #" ;"< #"sa=%s' &a distribui!" d# P%iss%" busa dar r#s$u#sta a $r%b(as r#&ai%"ad%s %" &%s 7it%s #s$#rad%s #" u" i"t#r3a&% d# ti#($% % d# #s$ai%. PROPIEDADES DE UN E>PERIMENTO POISSON: +. La $r%babi&idad $r%babi&idad d# %urr#"ia %urr#"ia #s #s &a (is(a $ara ua&5ui#ra ua&5ui#ra d# d# d%s i"t#r3a&%s i"t#r3a&%s d# i6ua& &%"6itud. ?. La %urr#"ia %urr#"ia % "% %urr#"ia %urr#"ia #" ua&5ui#r ua&5ui#r i"t#r3a&% i"t#r3a&% d# ti#($% ti#($% % #s$ai% #s$ai% #s i"d#$#"di#"t#. @. E& #$#ri(#"t% #$#ri(#"t% aat%ri% aat%ri% %"sist# #" %"tar %"tar #& "2(#r% "2(#r% d# 3##s 3##s 5u# %urr# #& #3#"t% #" u"a u"idad d# ti#($% % #s$ai%. La distribui!" d# $r%babi&idad $%iss%" ti#"# &a si6ui#"t# 4u"i!":
F!r(u&a 6#"#ra& x
P*>1
− μ
μ e x !
D%"d# p* X=x 1 $r%babi&idad d# %urr#"ias #" u" i"t#r3a&%
3a&%r #s$#rad% % $r%(#di% d# %urr#"ias #" u" i"t#r3a&% d# ti#($% % #s$ai% e ?.,+-?-
E#($&% + Ust#d d#s#a %"%#r #& "2(#r% d# #"4#r(%s 5u# &a" $%r &a (aa"a a u"a &)"ia r#6i%"a& dura"t# &a s#(a"a #" u" $#ri%d% d# u"a 8%ra. Si asu(i(%s 5u# &a $r%babi&idad d# 5u# u" $ai#"t# 5u# &a #s &a (is(a $ara uas5ui#ra d# d%s $#ri%d%s d# i6ua& durai!" = 5u# &a &ada % "% &ada d# u" $ai#"t# #" ua&5ui#r $#ri%d% #s i"d#$#"di#"t# d#& arrib% % "% #" ua&5ui#r %tr% $#ri%d%' #"t%"#s #s a$&iab &a distribui!" $%iss%". Si s# ti#"#" r#6istr%s 5u# #& "2(#r% $r%(#di% d# $ai#"t#s 5u# &a" #" u" $#ri%d% d# u"a 8%ra #s d# /' Cu9& s#r)a &a $r%babi&idad d# 5u# #" u"a 8%ra &u#" ? $ai#"t#s La 3ariab aat%ria #s: X "2(#r% d# $ai#"t#s 5u# &a" #" u"a 8%ra a &a &)"ia. S# ti#"# %(% dat% /. P%r &% ta"t% P * x ?1 s#r)a: x
P * x ?1
− μ
μ e x !
4
2
( 2.71828 )−
4
0.+/H
2!
A5u) i"3%&ura(%s #& i"t#r3a&% d# ti#($% d# u"a 8%ra' $#r% $%d#(%s uti&iar %tr%s i"t#r3a&%s d# ti#($%' $%r ##($&%' si s# 5ui#r# %"%#r &a $r%babi&idad d# 5u# &u#" ? $ai#"t#s' #" &%s si6ui#"t#s @0 (i"ut%s. A8%ra' #& i"t#r3a&% d# ti#($% s# 8a (%di4iad% a @0 (i"ut%s *.H 8%ras1' $%r &% 5u# t#"#(%s 5u# austar #& 3a&%r d# 5u# #st9 #" 8%ras. Est% #s ? ada (#dia 8%ra. x
P * x ?1
− μ
μ e x !
2
2
(2.71828 )−
2
2!
0.?,0,
U"a 3ariab 5u# ti#"# u"a distribui!" $%iss%" %" u" "2(#r% %"%id% d# #"sa=%s " = u"a $r%babi&idad %"%ida d# 7it%s $' s# $ud# d#t#r(i"ar su 3a&%r #s$#rad%' su d#s3iai!" #st9"dar = 3aria"a #s:
E * x 1np
σ x
√ μ
V * x 1np
La distribui!" d# P%iss%" s# $u#d# %"sid#rar %(% #& &)(it# d# u"a distribui!" bi"%(ia& ua"d% ; n< #s (u= 6ra"d# = ; p< #s (u= $#5u#a.
Cuando n es grande (n≥30) y ree !nde"!n!da#en$e y p es %e&ue'a on $enden!a a ero de $a #anera &ue a #ed!a (np*+) en$ones as %ro,a,!!dades ,!no#!aes se a%ro-!#an a a ".r#ua de Po!sson/ La $r%babi&idad d# t#"#r u" aid#"t# #" #& sa&!" d# &as# d# da"a #s d# .00' #" u" 6ru$% d# +00 a&u("%s' u9& #s &a $r%babi&idad d# 5u# 8a=a u" aid#"t#. Variab aat%ria: > "2(#r% d# aid#"t#s #" #& sa&!" d# &as#. n+00
p0.00
P%r &% ta"t%
EN E>CEL: +
μ
$ara np
+00*0.001 0.
a&u&ar &a $r%b. Au(u&ada.
P * x +1 x
P * x +1
− μ
μ e x !
0.6
1
( 2.71828 )−
1
1!
0.@?J?
0. = 0 #s
S# $u#d# r#s%&3#r #& $r%b(a uti&ia"d% E>CEL' &a si"tais d# &a 4u"i!" #s: POISSON .DIST *+'0.'01
La #"tra& t#!"ia d# u" 8%t#& r#ib# u" "2(#r% d# &&a(adas $%r (i"ut% %" (#dia 0'H. D#t#r(i"ar &a $r%babi&idad d# 5u# #" u" (i"ut% a& aar: a res%ues$a
a enon$rar en e 1!deo/
a1 S# r#iba u"a 2"ia &&a(ada. b1 S# r#iba" u" (9i(% d# d%s &&a(adas
Para reso1er : Si #& ?K d# &%s 6arra4%"#s r#t%r"abs d# a6ua Etr%$ura s# d#t#ta" 4isuras a"t#s d# s#r &"ad%s' d#t#r(i"# &a $r%babi&idad d# 5u# i"% d# &%s $r!i(%s /00 6arra4%"#s 5u# s# i"t#"t#" &"ar $r#s#"t#" 4isuras. R J.+K
Ust#d sab# 5u# dis$%"# #" #st# (%(#"t% d# r#4r#s%s 6as#%s%s = ada u"% d# sus i"3itad%s %"su(#" #" $r%(#di% +.H r#4r#s%s #" u"a 8%ra. Cu9& #s &a $r%babi&idad d# 5u# #" &a si6ui#"t# 8%ra "% a&a"#" &%s r#4r#s%s R ??.@+K
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