Question

Mean of 9 numbers is 14. One number 12 was excluded. Find the new mean.

give me a proper solution​

Answer 1

Answer:

new mean =14.25

Step-by-step explanation:

$mean = \frac{s.of \: o.}{no.of \: o.} \\ 14 = \frac{s.of \: o.}{9} \\ s.of \: o. = 14 \times 9 = 126 \\ new \: s.of \: o. = s.of \: o. - 12 = 126 - 12 = 114 \\ new \: no.of \: o. = no.of \: o. - 1 = 9 - 1 = 8 \\ new \: mean = \frac{new \: s.of \: o.}{new \: no.of \: observation} = \frac{114}{8} \\ new \: mean= 14.25$