The average of five consecutive numbers is a. If the next two numbers are also included, how will the average vary?
Question and options
The average of five consecutive numbers is a. If the next two numbers are also included, how will the average vary?
- It shall increase by 1
- It shall increase by 1.4
- It shall remain the same
- It shall increase by 2
Answer and explanation
Correct answer: A - It shall increase by 1
The five numbers are a-2 ... a+2, so the next two are a+3 and a+4. New average = (5a + 2a + 7)/7 = a + 1. It increases by 1.
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