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標題:
發問:
The below table shows the daily expenses of students.Daily Expenses($) 10-19 20-29 30-39 40-49 50-59Frequency 18 10 3 4 5Find (a) the mean, (b) the modal class and (c) the standard deviation.感激萬分!! 顯示更多 The below table shows the daily expenses of students. Daily Expenses($) 10-19 20-29 30-39 40-49 50-59 Frequency 18 10 3 4 5 Find (a) the mean, (b) the modal class and (c) the standard deviation. 感激萬分!!
最佳解答:
(a) mean = [(19+10)/2 x 18+(29+20)/2 x 10+(39+30)/2 x 3+(49+40) x 4/2+(59+50)/2 x 5]/ (18+10+3+4+5) =(261+245+103.5+178+272.5)/40 =26.5 (b) mode=10-19 (c) standard deviation = 26.5-(19+10)/2 =14.17745 (7 sig fig) (by calculator)
其他解答:
(a)mean= [(19+10)/2*18+(29+20)/2*10+(39+30)/2*3+(49+40)*4/2+(59+50)/2*5]/18+10+3+4+5 =(261+245+103.5+178+272.5)/40 =26.5 (b)mode=10-19 ?(the frequency is 18 the most) (c)=mean-mode = 26.5-(19+10)/2 =12
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中學數學圖表一問(急)發問:
The below table shows the daily expenses of students.Daily Expenses($) 10-19 20-29 30-39 40-49 50-59Frequency 18 10 3 4 5Find (a) the mean, (b) the modal class and (c) the standard deviation.感激萬分!! 顯示更多 The below table shows the daily expenses of students. Daily Expenses($) 10-19 20-29 30-39 40-49 50-59 Frequency 18 10 3 4 5 Find (a) the mean, (b) the modal class and (c) the standard deviation. 感激萬分!!
最佳解答:
(a) mean = [(19+10)/2 x 18+(29+20)/2 x 10+(39+30)/2 x 3+(49+40) x 4/2+(59+50)/2 x 5]/ (18+10+3+4+5) =(261+245+103.5+178+272.5)/40 =26.5 (b) mode=10-19 (c) standard deviation = 26.5-(19+10)/2 =14.17745 (7 sig fig) (by calculator)
其他解答:
(a)mean= [(19+10)/2*18+(29+20)/2*10+(39+30)/2*3+(49+40)*4/2+(59+50)/2*5]/18+10+3+4+5 =(261+245+103.5+178+272.5)/40 =26.5 (b)mode=10-19 ?(the frequency is 18 the most) (c)=mean-mode = 26.5-(19+10)/2 =12
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