Question

(c) The arithmetic mean of ten number is 12. Ifadding 11th number the mean becomes 13. Find11th number​

Answer 1

Answer:

Step-by-step explanation:

Sum of ten numbers = Mean×10=12×10=120

Sum of 11 numbers =

Mean ×11 = 13×11 = 143

So 11th no. is 143-120=23

Answer 2

Answer:

23

Step-by-step explanation:

SUM OF NUMBERS =120 AS 120/10=12

THEREFORE,

120+x/11=13

120+X=143

X=23