Page 156 - Bangladesh_classwiz_BOOK2018_rev_Neat

3 wU jvj e‡ji †ÿ‡Î,

15
‡gvU NUbv msL¨v =
3
jvj e‡ji NUbv msL¨v =
8
3

(Key log- a8qP2O7qP1$15qP3$+a
8qP3$15qP3=)

14.7 m¤¢vebvi cwiwg‡Zv web¨vm (Normal Probability Distribution)

ClassWiz K¨vjKz‡jU‡ii mvnv‡h¨ Av`k© cwiwg‡Zv web¨vm ev Pj‡Ki m¤¢vebv wbY©q Kiv hvq|

cÖvK…wZKfv‡e msNwUZ A‡bK NUbv m¤¢vebvi cwiwg‡Zv web¨vm †g‡b P‡j Ges wPÎwU cwiwg‡Zv †iLv (Bell
shaped curve), hv wb‡P †`Lv‡bv n‡jv-

wPÎ- cwiwg‡Zv ‡iLv

2
[Av`k© cwiwg‡Zv web¨v‡mi Mo, μ = 0 Ges †f`v¼, = 1]
cwiwg‡Zv †iLvi Øviv Ave× †ÿ‡Îi †ÿÎdj 1. cwiwg‡Zv †iLvi AvIZvaxb ‡Kv‡bv wbw`©ó As‡ki ‡ÿÎdj cwiwg‡Zv

m¤¢vebv e¨envi K‡i wbY©q Kiv hvq| cwiwg‡Zv ‡iLvi ga¨we›`y, Av`k© cwiwg‡Zv ˆ`e PjK, = 0 †Z mgvb `yÕfv‡M
wef³ nq| wZbwU wfbœ e¨ewa‡Z, Gi m¤¢vebv wbYq Kiv hvq| hv†`i wPÎ wb‡¤œv †`Iqv n‡jv-
©
P(t) Q(t) R(t)

wPÎ:02

hv‡`i m¤¢vebv n‡”Q,

( ) = ( ≤ ) GLv‡b,
Probability (- < z ≤ 0) = 0.5
( ) = (0 ≤ ≤ ) Probability (0 ≤ z < ) = 0.5

( ) = ( ≥ )
cwiwg‡Zv web¨vm Kivi R‡b¨ K¨vjKz‡jUiwU‡K 1 − -G Avb‡Z n‡e, Zvi Rb¨
w61 Pvc‡Z n‡e| w¯Œb¸‡jv wb‡¤œv †`qv n‡jv|

151