Add the numbers together, and then - since there are three numbers - divide the result by 3.
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27.3 reucuring (33333333333333)
Use the definition of average, write the corresponding equation, and solve it. In this case, the equation is:(3 + x + 16 + 18) / 4 = 11 since there are four numbers.
To find the average of a set of numbers, you add all the numbers together and then divide by the total count of numbers. In this case, the sum of 16, 18, 14, and 12 is 60. Since there are four numbers in the set, you divide 60 by 4 to get an average of 15.
composite numbers between 11 and 21:12 14 15 16 18
12, 14, 15, 16, and 18 are composite numbers 11, 13, 17, and 19 are prime numbers