Question

Lillian owns a small business selling ice-cream. She knows that in the last week 12 customers paid cash, 28 customers used a debit card, and 42 customers used a credit card.
Based on these results, express the probability that the next customer will pay with something other than a debit card as a fraction in simplest form.

Answer 1

Total customers = 12 + 28 + 42 = 82.
Customers who did not pay by debit = 12 + 42 = 54.
Probability = 54/82 = 27/41.