Question

Q-1. What is the mean of first five prime numbers .
Q-2. Find the mean of first seven even natural no.
Q-3. Find the median of first 11 multiple of 8 .
Q-4. Find the mean of all prime no. lying between 20 & 30 .

Answer 1

1.First five prime numbers are 2,3,5,7,11
so, 2+3+5+7+11/5
28/5=5.6

2.First seven even natural numbers are 2,4,6,8,10,12,14
so,2+4+6+8+10+12+14/2
56/7=8

3.First 11 multiples of 8 are 8,16,24,32,40,48,56,64,72,80,88
so,8+16+24+32+40+48+56+64+72+80+88/2
528/11=48

4. 23 and 29 are the prime numbers between 20 and 30.
so,23+30/2
53/2=26.5