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50 संख्याओ का औसत 30 है । बाद में ज्ञात हुआ की दो मानो को 28 एव 31 के स्थान पर 82 एव 13 गलती से अंकीत किया गया । सही औसत ज्ञात करे ?A. 36.12B. 30.66C. 29.28D. 38.21 |
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Answer» Correct Answer - C According to the question The mean of 50 no . Is =30 Sum of 50 no is =50x30=1500 later it was discovered that two entries were wrongly entered as 82 and 13 instead of 28 and 31. `therefore` Difference =(82+13)-(28+31) =95-59=36 (Extra) `therefore` Actual sum of 50 numbers is = 1500-36=1464 `therefore` Actual avg. =`1464/50=29.28` Alternate Sum of wrongly entered numbers =82+13=95 sum of correct numbers =28+31=59 Required average `=30+(59-95)/50 =30-0.72 ` =29.28 |
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