1.

1). 202). 243). 264). 28

Answer»

The MEAN of 14 observations = 11

⇒ Sum of 14 observations = 11 × 14 = 154

Let the 15th observation be ‘X’.

⇒ (154 + x)/15 = 12

⇒ 154 + x = 12 × 15 = 180

⇒ x = 180 – 154 = 26

∴ The 15th observation = 26



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