Question

average of 11 items is 6.5 if one item 7.5 is deleted from the data then average of remaining items ​

Answer 1

average of 11 items =6.5

one item 7.5 is removed

average of remaing:

average =sum of observation/no. of observation

6.5=x-7.5/11

6.5*11=x-7.5

x-7. 5=143/2

x=143/2+75/10

x=1430+150/20

x=1445/2

=722.5

now, 7.5 is removed=722.5-7.5

=715

average of remaining items=715/10

=71.5

Answer 2

Answer:

maybe your ans

Answer=71.5

Step-by-step explanation:

average of 11 items =6.5

one item 7.5 is removed

average of remaining:

average =sum of observation/no. of observation

6.5=x-7.5/11

6.5*11=x-7.5

X-7. 5=143/2

x=143/2+75/10

x=1430+150/20

x=1445/2

=722.5

now, 7.5 is removed 3D722.5-7.5

=715

average of remaining items=215/10

=71.5