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प्रश्न
The mean of 2, 7, 6 and x is 5 and the mean of 18, 1, 6, x and y is 10. What is the value of y?
पर्याय
5
10
20
30
MCQ
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उत्तर
20
Explanation:
From `(2 + 7 + 6 + x)/4 = 5`
⇒ 15 + x = 20
⇒ x = 5
Then `(18 + 1 + 6 + x + y)/5 = 10`
⇒ `(25 + x + y)/5 = 10`
Substituting x = 5 gives `(30 + y)/5 = 10`
⇒ 30 + y = 50
⇒ y = 20
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