Question

the mean of 10 numbers is 35 if 3 is added to every number then find the new mean​

Answer 1

since,

mean= SUM OF OBSERVATIONS/TOTAL NUMBER OF OBSERVATIONS

let sum of observations be x

x/10 = 35

x=350 (1)

let new mean be f

ATQ,

f= x+3+3...3/10

f=x+30/10

f=350+30/10

f=380/10

f=38

new mean is 38