Question

If the mean of a set of observations x1, x2....,x10 is 20 , then the mean of x1+4, x2+8, x3+12 ,....x10+40 is

Answer 1

Answer:

Step-by-step explanation:

mean =(x1+x2-------x10)/10

20 = (x1+x2------x10)/10

20*10 = (x1+x2-----x10)

200 = (x1+x2----x10)

the sum of (x1+x2----x10) is 200

now , equation is increasing   by 4, it means that the whole equation will increase by 220

then,

new mean ={(x1+x2-----x10)+ 220}/10

new mean =(200+220)/10

new mean = 420/10

new mean = 42