The mean of a set of marks is 10. If each member of the set is doubled and increased by unity, then the new mean would be
A) 13
B) 12
C) 21
D) 20
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The arithmetic mean of a set of 10 numbers is 20. If each number is first multiplied by 2 and then increased by 5, then what is the mean of the new numbers?
Answer :
Mean of 10 number is 20.
Sum of 10 numbers = 200
When each number is multiplied by 2 and 5 is added to each number, new sum = 2×200+10×5=450
Now, new mean = 450/10 = 45
The correct answer is 45.
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