Correct Answer: Option B

Explanation

The mean is the average of the numbers. It is easy to calculate: add up all the numbers, then divide by how many numbers there are. In other words it is the sum divided by the count. 

thus we have; 

mean = 3.5 + 3.0 + 4.2 + 5.0 + 4.3 = 20 / 5 = 4

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