Question

The mean of numbers in an arithmetic progression can be found by ______ where $a$ is the first term and $l$ is the last term.

• A. $(a+l)/3$.
• B. $(a+l)$.
• C. $(a+2l)/2$.
• D. $(a+l)/2$.

Answer 1

Answer: (D)

$(a+l)/2$.

The mean of numbers in an arithmetic progression can also be found by the formula $(a+l)/2$ where a is the first term and l is the last term of the progression. Thus the correct answer is $d$.