Question

the mean of 12, 10,13, x, 17,18 is 15 find the value of x

Answer 1

$\huge{ \sf{ \green{ \mid{ \underline{ \overline{ \orange{ work \: out...}}}}}}}$

$\large{ \bold{ \red{ \underline{ \underline{Question...}}}}}$

$\sf{ \large{the \: mean \: of \: 12 \: \: 10 \: \: 13 \: \: x \: \: 17 \: \: 18 \: is \: 15. }} \\ \large{ \sf{ \red{\: find \: x.....?}}}$

$\large{ \bold{ \red{ \underline{ \underline{Given...}}}}}$

$\sf{ \large{ all \: the \: terms..}} \\ \sf{ \large{ \to \: and \: the \: mean(15)}}$

$\large{ \bold{ \red{ \underline{ \underline{to \: find..}}}}}$

$\large{ \sf{ \to \: value \: of \: x}}$

$\large{ \green{ \bold{ \underline{ \underline{solution..}}}}}$

$\large{ \sf{first \: of \: all...}} \\ \boxed{ \purple{ \sf{ \large{mean = \frac{sum \: of \: all \: terms}{no. \: of \: terms} }}}}$

$\large{ \sf{ \to \: terms \: = 12 \: \: 10 \: \: 13 \: \: x \: \: 17 \: \: 18}} \: \\ \\ \large{ \sf{ \to \: mean = 15}} \\ \\ \large{ \sf{ \to \: no \: of \: terms = 6}} \\ \\ \large{ \sf{then = > 15 = \frac{12 + 10 + 13 + x + 17 + 18}{6} }} \\ \\ \large{ \sf{ = > 15 = \frac{70 + x}{6} }} \\ \\ \large{ \sf{ = > 90 = 70 + x}} \\ \\ \large{ \sf{ \red{ \boxed{ = > x = 20}}}} \\ \large{ \bold{ \green{required \: answer = 20}}}$

$\large{ \bold{ \orange{nothing \: beats \: a \: great \: smile...}}} \\ \large{ \bold{ \orange{so \: keep \: smiling \: always..}}}$