Question

A detergent powder company is having a contest. Each pack of 1 kg contains one of the letters b, a, m and o. If in every 20 packs, there are four bs, five as, ten ms and one o what is the probability that a pack will have a b?

Answer 1

firstly we will check frequency of
b=4/20
a=5/20
m=10/20
o=1/20

now probability
probability is the possibility of a substance to occour that is calculated according to frequency
probability of b=4/20
=1/5
so probability of b is 1 in every 5 packets of detergent


hope this will help

Answer 2

Total Packs = 20 

Contain B = 4 


Therefore

probability = B/Total = 4/20 = 1/5