Question

mean of 1,2,3,4,5_______,100

Answer 1

Answer:

Sum of n terms of a series can be found by:

S(n) = n/2 (2a+(n-1)d)

Here, a = 1 d = 1 n = 100

So, sum of 100 numbers

S(100)=5050

mean = sum of observations/no. of observations

mean = 5050/100

mean=50.5

Answer 2

mean= (1+2+3+4+5..........+100)÷100
(100/2(1+100))÷100 =(50(101))÷100
. =5050÷100=50.5