Question

Hello, I am taking Quantitative methods for business, which has a lot of excel based mathematics and I was wondering if anyone could help. Here is the question:

Refer to the table that illustrates customer’s complaints about a manufacturing company.

A. What is the probability a customer complained during the guarantee period?

B. What is the probability that a customer complained about an electrical problem or a mechanical problem?

Table is included in attachment. Also Thank you!!!

Answer 1

Part A:

The probability that a customer complained during the guaranteed period is given by the number of costumers that complained during the guarantee period devided by the total number of students.

Therefore, the probability that a customer complained during the guaranteed period is
`(1,890)/(3,000) = (63)/(100)`



Part B:

The probability that a customer complained about an electrical problem or a mechanical problem is given by the sum of the probability that the customer complained about an electrical problem or the probability that the customer complained about a mechanical problem.

Therefore, the probability that a customer complained about an electrical problem or a mechanical problem is
`(900)/(3,000) + (1,050)/(3,000) = (1,950)/(3,000) = (13)/(20)`