Question

For a collection of 10 items, ∑x = 155, then the arithmetic mean is ______.
1. 10
2. 10.5
3. 15
4. 15.5

Answer 1

Correct Answer - Option 4 : 15.5

Given:

∑x = 155

n (no of items) = 10 

Formula used:

Arithmetic Mean = ∑x / number of items

Calculation:

∴ Arithmetic Mean = 155 ÷ 10 = 15.5