Answer
Brands of toothpaste = 8
Brands of dental rinse = 5
P(purchase the correct brands of both products) = 1 / 8C1 x 5C1
= 1 / 8 x 5
= 1/40
= 0.025
It is an unusual event because its probabilityi s less than 0.05, means chance of its happening is very low
Work Step by Step
As given in answer
