Final answer:
Discrete variables are countable values, such as the number of pregnancies, number of hospital beds, and number of stars in the sky, as opposed to continuous variables like height in centimeters.
Step-by-step explanation:
The question is asking us to identify which variables are discrete. A discrete variable is a variable that can take on a countable number of values. It often represents things that can be counted, such as the number of occurrences of an event. In contrast, a continuous variable can take on an infinite number of values within a range.
Looking at the options provided:
- A. Number of pregnancies - This is discrete as you can count the number of pregnancies.
- B. Height in centimeters - This is continuous because height can be measured to many decimal places.
- C. Number of hospital beds - This is discrete because you can count the number of beds in a hospital.
- D. Number of stars in the sky - This is theoretically discrete because you could count the stars, but in practice, this is a very large number and not truly countable by conventional means. However, for the purposes of this question, we will consider it as a countable quantity.
Therefore, the discrete variables in the list provided are the number of pregnancies, the number of hospital beds, and the number of stars in the sky.