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100 संख्याओ का औसत 46 है । बाद में ज्ञात हुआ की त्रुटी के कारण 16 को 61 तथा 43 को 34 अंकित किया गया । ये भी ज्ञात हुआ की कुल संख्याये 100 के स्थान पर 90 थी । सही औसत ज्ञात करे ।A. 50B. 50.7C. 52D. 52.7 |
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Answer» Correct Answer - B According to the question mean of 100 items is =46 Sum of 100 items =46x100=4600 Misread 61 instead of 16 and 34 instead of 43 `therefore` Difference =(61+34)-(16+43)=95-59=36 (more ) `therefore` Actual sum =4600-36=4564 Now total observations are =90 `therefore` Actual average =`4564/90` =50.7 Alternate Subtract the misread and add the correct from the sum Sum =100x46=4600 New sum =4600-(61+34)+(16+43)=4564 New number of observations =90 New average =`4564/90` =50.7 |
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