Question 9 • Probability and Statistics with Applications Honors Sem-2-FL-1210300 (2024-2025)
Josie believes that her mom calls her at the most inconvenient times. As a matter of fact, Josie thinks that 80% of the times that her mom calls, she is busy doing important tasks such as schoolwork, driving, or feeding the family pets.Which is the best interpretation of this probability?
Answer
A
Josie’s mom is calling her 80% of the day.
B
If Josie is doing 10 important tasks in one day, her mom will call during 8 of those tasks.
C
Josie has an 80% chance of completing her important tasks without her mom calling her.
D
Over the course of many weeks, about 80% of the calls from Josie’s’ mom will come when she is busy doing important tasks.
Explanation
The 80% describes the proportion of her mom’s calls that happen while Josie is busy, not the proportion of the day or of Josie’s tasks. Over many calls, about 80 out of every 100 calls would come while she is doing important tasks. So the best interpretation is that about 80% of the calls over many weeks will come when she is busy.
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