Question

If the mean x, x+3, x+6,x+9 and x+12 is 10 then x is

Answer 1

Value \:of\: x = 4

Step-by-step explanation:

Given \: observations \:are \:\\x,x+3,x+6,x+9 \: and \: x+12 \: is \: 10

\boxed {Mean(x)=\frac{Sum\:of\: observations}{Number \: of \: observations}}

Mean=10

\implies \frac{x+x+3++x+6+x+9+x+12}{5}=10

\implies \frac{5x+30}{5}=10

\implies \frac{5(x+6)}{5}=10

\implies x+6=10

\implies x = 10-6

\implies x = 4

Therefore,

Value \:of\: x = 4

Answer 2

Answer:

mean = sum of no./no. of term

x+x+3+x+6+x+9+x+12/5 =10

=> 5x+30/5 =10

=>5x+30=5 *10

=>5x= 50-30

= >x= 20 /5

= >x = 4

hope it will help u:-)