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प्रश्न
Average of ten positive numbers is `barx`. If each number is increased by 10%, then `barx`
पर्याय
remains unchanged
may decrease
may increase
is increased by 10%
MCQ
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उत्तर
is increased by 10%
Explanation:
`(x_1 + x_2 + .... + x_10)/10 = barx`
⇒ `x_1 + x_2 + ... + x_10 = 10 barx`
⇒ `110/100 x_1 + 110/100 x_2 + ... + 110/100 x_10 = 110/100 xx 10 barx`
⇒ `(110/100 x_1 + 110/100 x_2 + ... + 110/100 x_10)/10 = 11/10 barx`
⇒ Average is increased by 10%
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Average (Entrance Exam)
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