Out of seven given numbers, the average of the first four numbers is 4 and that of the last four numbers is also 4. If the average of all the seven numbers is 3, fourth number is
Options:
A . 4
B . 11
C . 7
D . 3
Answer: Option B Answer: (b)Using Rule 1, Average of two or more numbers/quantities is called the mean of these numbers, which is given by$\text"Average(A)" = \text"Sumof observation / quantities"/\text"No of observation / quantities"$∴ S = A × n Fourth number = (4×4+4×4 – 3×7) = (16 +16-21) = 11
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