5. Find the mean of the following: a) first ten odd natural numbers. b) first eight prime numbers. c) first five multiples of 10. d) all the factors of 8.
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(a) Complete step-by-step answer:
The first ten odd natural numbers are 1,3,5,7,9,11,13,15,17,19.
(b) There are 8 prime numbers under 20: 2, 3, 5, 7, 11, 13, 17 and 19
(c) So, the first five multiples of 10 are: {10,20,30,40,50}.
(d) So all factors of 8: 1, 2, 4, and 8.
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Answer:
a) first 10 odd numbers
1 3 5 7 9 11 13 15 17 19
mean = sum / 10
= 1+3+5+7+9+11+13+15+17+19 / 10
= 10
b) first 8 prime numbers
2,3,5,7,11,13,17,19
mean = sum/8
= 77/8 = 9.625
c) first t multiples of 10
10,20,30,40,50
mean = sum/5 = 150/5 = 30
d) factors of 8
1,2,4,8
mean = sum/4
= 15/8
= 1.875
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