Question

the average of 5 consecutive numbers is n. If the next two numbers are also included, the average is (a) increses by 1 (b) remains the same (c) increases by 1.4 (d) increses by 2

Answer 1

Answer:

(a)increases by 1

Step-by-step explanation:

 let x is first no then x,x+1,x+2,x+3,x+4 are consecutive nos

 avg of this 5 nos is (x+x+1+x+2+x+3+x+4)/5=n

 x+2=n ;n=x+2

 add next 2 nos new avg is (x+x+1+x+2+x+3+x+4+x+5+x+6)/7=m

 x+3=m ;m=x+3

 new avg-old avg=x+3-x-2

 =1

 increased by 1