Page 165 - Bangladesh_classwiz_BOOK2018_rev_Neat

(K) 72 UvKvi †ewk, (L) Kgc‡ÿ 65 UvKv (M) 64 UvKv ev Zvi Kg (N) eo †Rvo 80 UvKv

(O) ˆ`wbK LiP 60 †_‡K 65 UvKvi g‡a¨ (P) 65 UvKvi †ewk 71 UvKvi Kg| cÖwZ‡¶‡Î m‡e©v”P QvÎ msL¨v
†ei Ki|

mgvavb- Mo = 68 Ges cwiwg‡Zv e¨eavb = 3| ‡gvU QvÎ msL¨v = 300
GLb (i) ‰`wbK LiP 74 UvKvi †ewk wKš‘ 80 UvKvi Kg
= (74 < < 80)
= ( 74−68 < −68 < 80−68 )
3 3 3
= (2 < < 4)
= 0.02272

(Key log- CTR414)pTR412)=)

Giƒc Qv‡Îi msL¨v = 0.2272 × 300 = 6.816 = 7 Rb (cÖvq)| myZivs 7 Rb Qv‡Îi ˆ`wbK LiP 74
UvKvi †ewk wKš‘ 80 UvKvi Kg|
(ii) (K) ‰`wbK LiP 72 UvKvi †ewk nIqvi m¤¢vebv
( > 72)

= ( > 72−68 )
3
= ( > 1.33)
= 0.091759

(Key log- CTR431.33=)

Giƒc Qv‡Îi msL¨v = 0.091759 × 300 = 27.52 ≈ 28 Rb

(L) ˆ`wbK LiP Kgc‡ÿ 65 UvKv = ( ≥ 65)
= ( ≥ −1)
= .8413

(Key log- CTR43p1=)

Giƒc Qv‡Îi msL¨v = . 8413 × 300 = 252.402 ≈ 253 Rb

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