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The proportion of all students who have twenty-twenty (20-20) vision is 0.170. A random group of 50 students is selected and their eyesight checked. 5) a) How many students in this group would you expect to have 20-20 vision? That is, what is the mean number of 20-20 vision students among groups of 50 students? b) What is the probability that only 5 or fewer of them have 20-20 vision? c) If it turned out that 27 of the 50 had 20-20 vision, would that be an unusual result? A rare result?
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Le t ー Proportion obaH students esho have tecnly-tel n 3 120-20) vision =0.170 n=50 ··· 」) There arc fixed number of tids icnsso 2> Feach ㅓiel has only-fvo. Outcomes-」.c. havin 20-20 vislon Not ha ving 20-20 vision 3x Pro babilty ot gacess (havia 20-20 vis on) Thersos at propeatics ot blomial distributadton dxe Satisdyeel, e usc binostutaton to solve the 20m qyes Hon P: 0470 Numb ot tudints in tis oup aould expeet to 20-20 vision 50-*0470:8 - nap: P4 50o 17) ( 3-0.036 すな PYSS) 0 0001 +0 000g + 0 0046+0 02S4 +0-0361 0o 637

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