Question

calculate arithmetic mean
size 5,10,15,20
frequency 2,1,4,3​

Answer 1

Answer:

1234567891011121314151617181920

Answer 2

Concept :-

Arithmetic mean is equivalent to summation of product of frequency and class upon total frequency.

Solution:-

Now, summation of(frequency × class) = 5×2+10×1+15×4+20×3

= 10+10+60+60

=140

summation of frequency = 2+1+4+3 = 10

Arithmetic mean = 140/10 = 14