Question

the mean of 3 numbers is 10 the mean of other four number is 12 find the mean of all numbers​

Answer 1

Answer:11.14 or 78/7

Step-by-step explanation:

Let sum of first three numbers be x then

Mean= sum of all digits/ total digits

10=x/3

x= 30

Now,

Sum of last four digits be y then

Mean = sum of digits/total digits

12= y/4

y=48

Now sum of all numbers is x+y

30+48= 78

Now mean of all numbers

Mean= 78/7 or 11.14

Answer 2

Step-by-step explanation:

the mean of three numbers = 10

so, the sum of three no. = 3×10 = 30

the mean of four number = 12

so, the sum of four no. = 12×4 = 48

Therefore, the sum of seven no. = 30+48 = 78

the mean of all no. = 78÷7 = 11.14 (approximately)