At a fabric store, the probability that a customer buys thread is 0.15. The probability that a customer buys a needle given that
the customer buys thread is 0.25. Which statement is true?
A. Buying a needle and buying a thread are independent events.
B. Every customer who buys a thread also buys a needle.
C. Buying a needle and buying a thread are dependent events.
D. The probability that a customer buys a needle and thread is a 0.10.
C. Buying a needle and buying a thread are dependent events.
Explanation:
The first statement is incorrect because the given events are dependent on each other because the probability that a customer buys a needle given that the customer buys thread is 0.25.
The second statement is incorrect because we cannot say all those who buy a thread also buy a needle.
The fourth statement is incorrect because the probability that a customer buys a needle and thread is
The total number of leaves that was collected by Lisa is the product of the number of days in a week and the number of leaves she collected per tree. This is shown below, (7 trees / week) x (7 leaves / 1 tree) = 49 leaves / week Thus, Lisa collected 49 leaves in a week.
