2. Which of the following variables are discrete, and which are continuous? Explain your answers.

Number of items purchased by a customer at a grocery store

Time required to solve a puzzle

Length of a piece of lumber

Number out of 10 customers who pay with a credit card

Discrete: Number of items purchased by a customer at a grocery store. Number out of 10 customers who pay with a credit card.

Continuous: Time required to solve a puzzle; Length of a piece of lumber.

Step-by-step explanation:

Consider the provided information.

A discrete variable is a variable whose value is obtained by counting and they can be described by an integer value.

A continuous variable is a variable whose value is obtained by measuring.

Thus, discrete variables are:

The number of items purchased by a customer at a grocery store.

Number out of 10 customers who pay with a credit card

Continuous variables are:

Time required to solve a puzzle.

Length of a piece of lumber.