The produce manager at a farmer's market was interested in determining how many oranges a person buys when they buy oranges.
He asked the cashiers over a weekend to count how many oranges a person bought when they bought oranges and record this number for analysis at a later time. The data is given below in the table. The random variable x represents the number of oranges purchased and P(x) represents the probability that a customer will buy x apples. Determine the mean number of oranges purchased by a customer.
x 1 2 3 4 5 6 7 8 9 10
P(x) 0.05 0.19 0.20 0.25 0.12 0.10 0 0.08 0 0.01
A) 5.50 B) 3 C) 4 D) 3.97
Question 2
The human resources department of a large, well-known telecommunications firm is behind schedule in sampling the job satisfaction of the company's employees.
In an effort to catch-up, the HR manager quickly goes down an alphabetical list of employees and e-mails a survey to every tenth employee. An neutral third party collects all surveys and ensures all of the selected employees respond to the survey. What sampling method best describes what the HR manager is doing?
A) Multistage sampling B) Cluster sampling
C) Stratified sampling D) Systematic sampling
Photograph of a person with a cataract in the right eye.
(A) Scratch test; patient is exposed to allergens through a light scratch on the skin; (B) Positive
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