Quiz 3 with Solution for Introduction to Statistics | STAT 1222, Quizzes of Statistics

Download Quiz 3 with Solution for Introduction to Statistics | STAT 1222 and more Quizzes Statistics in PDF only on Docsity! ol cn dtandi? atten formu hs > fa Xt ( fr x) a Quiz 3 : Stat 1222-010 (Professor: Dr. A. Biswas) 2/26/09 NQMC! erence TE ID#: 1. Let z denote the Standard Normal random variable. Find the following probabilities. 3 pts.) P(z>-1 ATER Thy ye Jr . (a) (3 pts.) P(z>-1) 1) aie SEL = BAZ Z-}o "8413 Answer: (correct up to four decimal places) = tee Ub 2-6 — Meg oft f tess $508 = O49 E (b) (8 pts.) P(-1.65 <z < 1.65). . Oi 22 mide b 40] bes le ltttmal ve ly, Answer: ___/¥! ____ (correct up to four decimal places) Shracted aitea = | Gatie “gple alm ca - Eft ohty, (c) (4 pts.) Ple<-2o0rz>3) 4 A Wie 0003 C I+ 2/696) ops = hy, Py a-eke 273) yePlze| IPL B23) Answer: bla (correct up to four decimal places) ; “= ‘022% 1° 1013 ‘ = "O24, 2. The scores on a statistics test were normally distributed with a mean of 78 and a standard deviation of 7.3. (a) (5 pts) A student who took the test was randomly selected. The probability that he scored between RR 8 Cosest to MFG PO F-2 a) 6492.) b) 3409 c) 9001 4) 8721) 5312 ZX dn Ke (geve | PGs excas)= Ps 78 Lae HS =) Fe 3 2Pl--+hl £2 2 Be say Mide sss wis tid em tl 2 *°49d0l- “SYOE = 6 6492. Zin ~ 4) o Zz (b) (8 pts) If 100 students are randomly selected, how many are expected to score higher than 90 points. a)50 db) 95 O58) d)10 e) 15 . . i fe , P a) - S te} ql- pv epertion lec tun en oO = KEx7 40) = (2 > ies } ~Pl2 > 1° bG) = -¢ 50s 4495 9999 . ? y _ ; i Shee > Hew mand Jota! x Fiafocton ary ty = feo xepyeg e beep So w I