Question

find the mean of:
i) first 10 composite numbers.
ii) factors of 18​

Answer 1

i.First 10 composite numbers are : 4, 6, 8, 9, 10, 12, 14, 15, 16, 18. Mean = Sum of all observations ÷ Total no: of observations. Sum of all observations = 4 + 6 + 8 + 9 + 1 0 +12 + 1 4 +15+ 16 + 18 = 112. Total no : of observations : 10. Mean = 112 / 10 = 11.2.

ii.What Are the Factors of 18? Factors of a number are the numbers that divide the given number exactly without any remainder. According to the definition of factors, the factors of 18 are 1, 2, 3, 6, 9, and 18. So,18 is a composite number as it has more factors other than 1 and itself.