Question

the mean of 50 numbers is 18 the new mean will be _ if each observation is increased by 4​

Answer 1

Answer:

Given,

( x1 + x2 + x3 + ....... + x50 ) / 50 = 18

x1 + x2 + x3 + .......+ x50 = 18 *50 ____(I)

Now , If each observation is increased by 4

Then,

Mean = (x1+4 + x2+4 + x3+4 + ........+ x50+4) / 50

= (x1 + x2 + x3 + ...... + x50) 4 / 50

= ( 18*50) 4 / 50

= 18*50*4 / 50

= 18*4

= 72