STAT 053.12 - Solutions to Quiz 2

STAT 053.12 - Solutions to Quiz 2 - NAME PM [(ALPNH y STAT...

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Unformatted text preview: NAME PM [(ALPNH y STAT 53-12 Quiz 2 . eb . 28, 2008 ' Circle your section & TA's nam @ '37 38 39 ' TA: Rick Ravi [Show the steps in your work. It is not enough just to write down an answer without showing the calculations or explaining how you got the answer, as the case may be] g fifis 1. Suppose that the probability is 0.40 that a college student uses contact lenses. A V random sample of 8 college students is selected. ' Find the probability that fewer than 7 of them use contact lenses. 'Lo} X AWE W #5 ofstwlmk who am whetLaMm N2 [Wt X lg n BMWM «(q/l fl 5 # -: g ' '~ ‘ c Wabmb l;li u 5303b shalan use; what W99 '2 0'49 J W awe MM 1351C“ PI[X< q) _ * Wm WM) + we» + W03 ; ‘ ‘ 2. Suppose that scores on a test have a normalldistribution with mean score 400 5 PM“ 5 points and standard deviation 125 points. (a) Find the probability that a randomly selected person's score will exceed 250 points. . 11% X b2 UM hat/Mal 'f-V- allnob‘nfl Um lESl’ saw/£3 - (M‘wm mm”: 400W“ ' ~/ Sliding 0’: L95 - @ z 'M' 0 pl 0' 98L» 5) . “\S (b) Find the score t (points), such that the probability is 0.70 that a randomly selected 4' ‘7‘" person's score will exceed t (points). ll 3 ’\ p 'l . 7b): 0'70 .. L WC l9 am IAVPN’CQ Mllm M. m cm) flaw eh Mala? lA‘ [3' but We add (5 l o 040 : P(X7t>= l)(’(—Cg 7 6%) ml #42 Val 0’ a) 15: 0305019753 + 400 .M ...
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STAT 053.12 - Solutions to Quiz 2 - NAME PM [(ALPNH y STAT...

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