Mean & median

If the median of 1, 2, x, 4, 5 is 3 then its mean is

• 3

• 4

• 5

• 4.5

The median of the data 3, 7, 2, 11, 4 and 9 is:

• 5

• 5.5

• 6

• 6.5

The median of numbers 10, 8, 2, 7, 3, 8, 5, 1 is k. If 10 is replaced by 1, then new median is r. The value of (k-r) is:

• -1.5

• 0

• 1

• 2

Suppose mean of a series of 5 items is 30. Four values are, 10, 15, 10 and 55 respectively. Find the missing (5th) value of the series

• 55

• 60

• 65

• 70

The mean of 5 observations is 7. Later on, it was found that observations 4 and 8 were wrongly taken instead of 5 and 9. Find the corrected mean.

• 7.5

• 6.5

• 6.2

• 7.4