Question

Mean of 20 numbers is 18 if first ten numbers is multiplied by 4 then find the new mean

Answer 1

Answer:19.8

Step-by-step explanation:here the we should find increase in the mean. assuming that given data is the simple one. here  rate is 18 /20  then for the 1 no. the rate is 18/20*10=9*4=36   there is 36 more than the usual so we find mean by 36 + 360 / 20  =19.8