Question

2. Find the arithmetic mean of:

(i) first eight natural numbers,
(ii) first five prime numbers;
(iii) first six positive even integers, (iv) first five positive integral multiples of 3;
(v) all factors of 20.

3. The daily minimum temperature recorded (in degrees F) at a place during a week was as
under:

Monday
35.5

Tuesday
30.8

Wednesday
28.3

Thursday
31.1

Friday
23.8

Saturday
29.9

Sunday
32.7

Find the mean temperature of the week,​

Answer 1

2) arithmetic mean= sum of the values/total values

i) First eight natural numbers=1,2,3,4,5,6,7,8

arithmetic mean= 1+2+3+4+5+6+7+8/8

Ans = 36/8= 4.5

ii) First five prime numbers=2,3,5,7,11

mean=2+3+5+7+11/5

Ans = 28/5=5.6

iii) First six positive even integers=2,4,6,8,10,12

mean=2+4+6+8+10+12/6

Ans = 42/6 = 7

iv) First five positive multiples of three=3,6,9,12,15

mean= 3+6+9+12+15/5

Ans. = 45/5 = 9

v) factors of 20 = 1,2,4,5,10,20

mean= 1+2+4+5+10+20/6

Ans. = 42/6. = 7

3) Arithmetic mean= 35.5+30.8+28.3+31.1+23.8+29.9+32.7/7

Ans. =184.07

hope this helps