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교육통계_과제3

저작시기 2011.03 |등록일 2013.04.09 한글파일한글 (hwp) | 2페이지 | 가격 2,000원

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3.3) mean (the number of shopper) = 975, Standard deviation = 15
① What percentage of the counts will lie between 960 and 990?
▷ Z(960) = (960-975)/15 = -1 (p(-1)=0.1587)
▷ Z(990) = (960-975)/15 = +1 (p(+1)=0.8413)
▷ p(1)-P(-1) = 0.8413-0.1587 =0.6826
② What percentage of the counts will lie below 975?
▷ Z(975) = (975-975)/15 = 0 (p(0)=0.5)
③ What percentage of counts will lie below 990?
▷ Z(990) = (990-975)/15 = 0 (p(+1)=0.8413)

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