A library has an average of 510 visitors on Sundays and 240 on other d...
Since the month begins with a Sunday, to there will be five Sundays in the month.
Required average = [510 x 5 + 240 x 25] 30
= 8550/30
= 285
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A library has an average of 510 visitors on Sundays and 240 on other d...
No of sunday. = 5 (1,8,15,22,29)avg of sunday (510) =x/5avg of other days(240)=x/25 x=8550avg no of visitors per day =8550/30=285
A library has an average of 510 visitors on Sundays and 240 on other d...
Solution:
Let the sum of 15 numbers be S.
Given, average of 15 numbers =18
So, S/15=18 or S=270
When each number is multiplied by 9, then the sum of the new set of numbers will be 9 times the sum of the original set of numbers.
So, the sum of the new set of numbers = 9S = 9*270 = 2430
The number of elements in the new set of numbers is 15.
Therefore, the average of the new set of numbers = (sum of the new set of numbers)/(number of elements in the new set of numbers) = 2430/15 = 162
Hence, the correct option is (c) 162.