IBPS RRB Office Assistant (Multipurpose) Prelims practice question
The mean of 12 numbers was calculated as 40. It was later found that one number was misread as 28 instead of 82. Find the correct mean.
From a IBPS RRB Office Assistant (Multipurpose) Prelims Quantitative Aptitude practice set · Quantitative Aptitude
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Correct answer: (C) 44.5
Old sum = 40×12 = 480. Correct sum = 480 − 28 + 82 = 534. Correct mean = 534/12 = 44.5.
हिंदी में प्रश्न
12 संख्याओं का माध्य 40 गणना किया गया था। बाद में पता चला कि एक संख्या को 82 के स्थान पर गलती से 28 पढ़ा गया था। सही माध्य ज्ञात कीजिए।
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उत्तर और व्याख्या देखें
सही उत्तर: (C) 44.5
पुराना योग = 40×12 = 480। सही योग = 480 − 28 + 82 = 534। सही माध्य = 534/12 = 44.5।
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