the mean of 9 values of a data is calculated as 15 . if 1 more is is introduce in data the mean of 10 values become 16 . Find the tenth value.
Mean of 9 values = 15
∴Sum of 9 values = 15 × 9 = 135
After the addition of a new value, the mean becomes 16.
Mean of 10 values = 16
∴Sum of 10 values = 16 × 10 = 160
Let the tenth value be x.
Thus, 135 + x = 160
⇒x = 160 - 135
= 25
Thus, the tenth value is 25.