Question

the mean of 20 number is 18 if 3 is added to each of the first 10 number find the mean of new set of 20 number​

Answer 1

Answer:

19.5

Step-by-step explanation:

given mean of 20 numbers = 18

=> sum of the 20 no.s  = 18*20 = 360

now we add 3 each to the first 10 no.s

=> we are adding 3*10 = 30 to the sum of 20 no.s

ie, now we have the sum of 20 no.s = 360 + 30 = 390

so the new mean = 390/20 = 19.5

Answer 2

Answer:

here is your answer. And the answer is 19.5 . Mark branliest please