The average of a group of numbers is the sum of the numbers divided by the number of numbers.
Because this is probably a homework problem, I won't give you the answer, but I can give you some help:
#1) What is the sum of 10, 3, 8, 4 and 5?
#2) How many numbers do you have?
#3) Your answer will be the answer to #1 divided by the answer to #2.
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The mean average is (6+12+10+4+3)÷5 = 7 The median average is middle number of {3, 4, 6, 10, 12} = 6 There is no mode average as every number appears with the same frequency (of 1).
Average(5, 10, 15) = (5 + 10 + 15)/3 = 30/3 = 10
(6 + 12 + 10 + 4 + 3) ÷ 5 = 7 Therefore, 7 is the average of the five numbers given in the question.
Average of 4, 5 and 6 = (4+5+6)/3 = 15/3 = 5
No ------------------------------------------------ 4/5 = (4×2)/(5×2) = 8/10 8 ≠ 3 → 8/10 ≠ 3/10 → 4/5 ≠ 3/10