Find the mean of 12, 15, 7, 8 and ‘x +13’, if x = 2

Numbers are = 12, 15, 7, 8, (x + 13)

⇒ where x = 2,

⇒ 12, 15, 7, 8, (2 + 13)

⇒ 12, 15, 7, 8, 15

$Mean = \frac{Sum\, of\, all\, no.}{Total\,no.} = \frac{12\;+\;15\;+\;7\;+\;8\;+\;15}{5} = \frac{57}{5}=11.4$