Question

If the mean of six observations x,x+2 ,x+4,x+6,x+8 and x+10 is 10, find the mean of last three

Answer 1

where is your answer mate

Answer 2

Answer:

x+x+2+x+4+x+6+x+8+x+10=10

/6

6x+30=10

/6

60

6x=60-30

6x=30

x=30/6

x=5

last 3=x+6 and x+8 and x+10

x=5

x+6=5+6=11

x+8=5+8=13

x+10=5+10=15

mean=11+13+15/3= 38/3

=12.6

so, hence proved 12.6 ans..