2
8, 9, 11 and 12
-4
It is 10.
The fourth number is 10. The sum of the four numbers is: 12 + 50 + 48 + fourth_number = fourth_number + 110 Mean = sum_of_numbers / how_many_numbers → sum_of_numbers = mean × how_many_numbers = 30 × 4 = 120 But from above: sum = fourth_number + 110 = 120 → fourth_number = 120 - 110 = 10
At least 12 numbers means 12 numbers or more
There are 12 such numbers.
(12 + 24 + 48)/3 = 84/3 = 28
you add all of the numbers in the group together and then divide the number you get by how many numbers are in the group EX: your group is 21, 32, 12, 15. you add 21+32+12+15= 80. then you divide 80 by 4 because you have four numbers in your group. so your mean is 20!
9 + 10 + 11 + 12 = 42
I assume you mean how many 4-digit numbers can be made from a set such as {A,A, B, C} where A, B and C are single digits. There are 12 such numbers.
6, 12, 18, 24 are four numbers with a GCF of 6
The numbers are 9, 10, 11 and 12.