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**.

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