# What is the Average of First 20 Odd Composite Numbers?

getcalc.com's average of first n composite numbers calculator, formulas, numbers chart, examples and workout to find what is the mean or average of first 20 odd composite numbers. **48.8** is an average of first 20 odd composite (non-prime) numbers mentioned in the below table, by substituting the total sum and count of numbers in the below formula.

## Numbers Chart

The below chart is the complete list of first 20 odd composite numbers for user reference.

First 20 Odd Composite Numbers Chart (9 - 85) | |||||||||
---|---|---|---|---|---|---|---|---|---|

9 | 15 | 21 | 25 | 27 | 33 | 35 | 39 | 45 | 49 |

51 | 55 | 57 | 63 | 65 | 69 | 75 | 77 | 81 | 85 |

## how to find the average of First 20 Odd Composite Numbers?

The below workout with step by step calculation shows how to find what is the average of first 20 odd composite numbers manually.

step 1 Input values:

The first 20 odd composite numbers

9, 15, 21, . . . . , 81, 85

step 2 Find the sum of first 20 oddcomposite numbers

9 + 15 + 21 + . . . . + 81 + 85 = 976

step 3 Divide the sum by 20

976/20 = 48.8

**48.8** is an average of first 20 natural numbers or positive integers.

### Average of Natural, Odd, Even and Prime Numbers

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